remove redundant/deprecated TwoPointRadial gradiet -- use TwoPointConical

This CL derived from https://codereview.chromium.org/1114243005/

BUG=skia:

Review URL: https://codereview.chromium.org/1117423003
diff --git a/samplecode/Sample2PtRadial.cpp b/samplecode/Sample2PtRadial.cpp
index 073fd82..764c2b1 100644
--- a/samplecode/Sample2PtRadial.cpp
+++ b/samplecode/Sample2PtRadial.cpp
@@ -11,15 +11,15 @@
 #include "SkGradientShader.h"
 
 
-class TwoPtRadialView : public SampleView {
+class TwoPtConicalView : public SampleView {
 public:
-    TwoPtRadialView() {}
+    TwoPtConicalView() {}
 
 protected:
     // overrides from SkEventSink
     virtual bool onQuery(SkEvent* evt) {
         if (SampleCode::TitleQ(*evt)) {
-            SampleCode::TitleR(evt, "2PtRadial");
+            SampleCode::TitleR(evt, "2PtConical");
             return true;
         }
         return this->INHERITED::onQuery(evt);
@@ -33,7 +33,7 @@
         SkScalar r0 = 100;
         SkPoint c1 = { 100, 100 };
         SkScalar r1 = 100;
-        SkShader* s = SkGradientShader::CreateTwoPointRadial(c0, r0, c1, r1, colors,
+        SkShader* s = SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1, colors,
                                                              NULL, 2,
                                                              SkShader::kClamp_TileMode);
 
@@ -48,5 +48,5 @@
 
 //////////////////////////////////////////////////////////////////////////////
 
-static SkView* MyFactory() { return new TwoPtRadialView; }
+static SkView* MyFactory() { return new TwoPtConicalView; }
 static SkViewRegister reg(MyFactory);
diff --git a/samplecode/SampleGradients.cpp b/samplecode/SampleGradients.cpp
index f328d76..12d24d2 100644
--- a/samplecode/SampleGradients.cpp
+++ b/samplecode/SampleGradients.cpp
@@ -82,24 +82,24 @@
     return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
 }
 
-static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
     center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
-    return SkGradientShader::CreateTwoPointRadial(
+    return SkGradientShader::CreateTwoPointConical(
                             center1, (pts[1].fX - pts[0].fX) / 7,
                             center0, (pts[1].fX - pts[0].fX) / 2,
                             data.fColors, data.fPos, data.fCount, tm);
 }
 
-static SkShader* Make2RadialConcentric(const SkPoint pts[2], const GradData& data,
+static SkShader* Make2ConicalConcentric(const SkPoint pts[2], const GradData& data,
                                        SkShader::TileMode tm) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
-    return SkGradientShader::CreateTwoPointRadial(
+    return SkGradientShader::CreateTwoPointConical(
                             center, (pts[1].fX - pts[0].fX) / 7,
                             center, (pts[1].fX - pts[0].fX) / 2,
                             data.fColors, data.fPos, data.fCount, tm);
@@ -108,7 +108,7 @@
 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
 
 static const GradMaker gGradMakers[] = {
-    MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2RadialConcentric
+    MakeLinear, MakeRadial, MakeSweep, Make2Conical, Make2ConicalConcentric
 };
 
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/samplecode/SampleShaderText.cpp b/samplecode/SampleShaderText.cpp
index 89abfc2..9fdae84 100644
--- a/samplecode/SampleShaderText.cpp
+++ b/samplecode/SampleShaderText.cpp
@@ -72,13 +72,13 @@
     return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
 }
 
-static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
     center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
-    return SkGradientShader::CreateTwoPointRadial(
+    return SkGradientShader::CreateTwoPointConical(
                             center1, (pts[1].fX - pts[0].fX) / 7,
                             center0, (pts[1].fX - pts[0].fX) / 2,
                             data.fColors, data.fPos, data.fCount, tm);
@@ -87,7 +87,7 @@
 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
 
 static const GradMaker gGradMakers[] = {
-    MakeLinear, MakeRadial, MakeSweep, Make2Radial
+    MakeLinear, MakeRadial, MakeSweep, Make2Conical
 };
 
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/samplecode/SampleSlides.cpp b/samplecode/SampleSlides.cpp
index 6899fc1..83e91bb 100644
--- a/samplecode/SampleSlides.cpp
+++ b/samplecode/SampleSlides.cpp
@@ -197,13 +197,13 @@
     return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
 }
 
-static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
     center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
-    return SkGradientShader::CreateTwoPointRadial(
+    return SkGradientShader::CreateTwoPointConical(
                                                   center1, (pts[1].fX - pts[0].fX) / 7,
                                                   center0, (pts[1].fX - pts[0].fX) / 2,
                                                   data.fColors, data.fPos, data.fCount, tm);
@@ -211,7 +211,7 @@
 
 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
 static const GradMaker gGradMakers[] = {
-    MakeLinear, MakeRadial, MakeSweep, Make2Radial
+    MakeLinear, MakeRadial, MakeSweep, Make2Conical
 };
 
 static void gradient_slide(SkCanvas* canvas) {