clean up (partially) colortable api

Needs this to land: https://codereview.chromium.org/2789853002/

Bug: skia:
Change-Id: I38d916a546b7fa64d000d973e695ddda24a589e7
Reviewed-on: https://skia-review.googlesource.com/10600
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>
diff --git a/samplecode/SampleBlur.cpp b/samplecode/SampleBlur.cpp
index 7e6a325..c43dc9b 100644
--- a/samplecode/SampleBlur.cpp
+++ b/samplecode/SampleBlur.cpp
@@ -4,6 +4,7 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "SampleCode.h"
 #include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
@@ -20,12 +21,9 @@
     }
 
     SkBitmap bm;
-    SkColorTable* ctable = new SkColorTable(c, 256);
-
     bm.allocPixels(SkImageInfo::Make(256, 256, kIndex_8_SkColorType,
                                      kPremul_SkAlphaType),
-                   nullptr, ctable);
-    ctable->unref();
+                   SkColorTable::Make(c, 256));
 
     bm.lockPixels();
     const float cx = bm.width() * 0.5f;
diff --git a/samplecode/SampleDitherBitmap.cpp b/samplecode/SampleDitherBitmap.cpp
index 676d4c3..bdd3071 100644
--- a/samplecode/SampleDitherBitmap.cpp
+++ b/samplecode/SampleDitherBitmap.cpp
@@ -56,12 +56,9 @@
     for (int i = 0; i < 256; i++) {
         c[i] = SkPackARGB32(0xFF, i, 0, 0);
     }
-    SkColorTable* ctable = new SkColorTable(c, 256);
-
     SkBitmap bm;
     bm.allocPixels(SkImageInfo::Make(256, 32, kIndex_8_SkColorType, kPremul_SkAlphaType),
-                   nullptr, ctable);
-    ctable->unref();
+                   SkColorTable::Make(c, 256));
 
     bm.lockPixels();
     for (int y = 0; y < bm.height(); y++) {
diff --git a/samplecode/SampleFilter.cpp b/samplecode/SampleFilter.cpp
index 66de8f3..d12f804 100644
--- a/samplecode/SampleFilter.cpp
+++ b/samplecode/SampleFilter.cpp
@@ -26,11 +26,9 @@
         SkPreMultiplyColor(SK_ColorRED), SkPreMultiplyColor(SK_ColorGREEN),
         SkPreMultiplyColor(SK_ColorBLUE), SkPreMultiplyColor(SK_ColorWHITE)
     };
-    SkColorTable* ctable = new SkColorTable(colors, 4);
     bm->allocPixels(SkImageInfo::Make(2, 2, kIndex_8_SkColorType,
                                       kOpaque_SkAlphaType),
-                    nullptr, ctable);
-    ctable->unref();
+                    SkColorTable::Make(colors, 4));
 
     *bm->getAddr8(0, 0) = 0;
     *bm->getAddr8(1, 0) = 1;
diff --git a/samplecode/SampleTinyBitmap.cpp b/samplecode/SampleTinyBitmap.cpp
index 4fb508b..6b01d11 100644
--- a/samplecode/SampleTinyBitmap.cpp
+++ b/samplecode/SampleTinyBitmap.cpp
@@ -19,13 +19,11 @@
     for (int i = 0; i < N; i++) {
         c[i] = SkPackARGB32(0x80, 0x80, 0, 0);
     }
-    SkColorTable* ctable = new SkColorTable(c, N);
 
     SkBitmap bm;
     bm.allocPixels(SkImageInfo::Make(1, 1, kIndex_8_SkColorType,
                                      kPremul_SkAlphaType),
-                   nullptr, ctable);
-    ctable->unref();
+                   SkColorTable::Make(c, N));
 
     bm.lockPixels();
     for (int y = 0; y < bm.height(); y++) {