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);