Simplify platform_canvas.h by recognizing that PlatformCanvas does not actually extend

skia/ext/platform_canvas_unittest.cc

Index: skia/ext/platform_canvas_unittest.cc
===================================================================
--- skia/ext/platform_canvas_unittest.cc	(revision 165342)
+++ skia/ext/platform_canvas_unittest.cc	(working copy)
@@ -194,7 +194,8 @@
 // regular skia primitives.
 TEST(PlatformCanvas, SkLayer) {
   // Create the canvas initialized to opaque white.
-  PlatformCanvas canvas(16, 16, true);
+  SkAutoTUnref<PlatformCanvas> holder(CreatePlatformCanvas(16, 16, true));
+  PlatformCanvas& canvas = *holder.get();
   canvas.drawColor(SK_ColorWHITE);
 
   // Make a layer and fill it completely to make sure that the bounds are
@@ -211,7 +212,8 @@
 // Test native clipping.
 TEST(PlatformCanvas, ClipRegion) {
   // Initialize a white canvas
-  PlatformCanvas canvas(16, 16, true);
+  SkAutoTUnref<PlatformCanvas> holder(CreatePlatformCanvas(16, 16, true));
+  PlatformCanvas& canvas = *holder.get();
   canvas.drawColor(SK_ColorWHITE);
   EXPECT_TRUE(VerifyCanvasColor(canvas, SK_ColorWHITE));
 
@@ -238,7 +240,8 @@
 // Test the layers get filled properly by native rendering.
 TEST(PlatformCanvas, FillLayer) {
   // Create the canvas initialized to opaque white.
-  PlatformCanvas canvas(16, 16, true);
+  SkAutoTUnref<PlatformCanvas> holder(CreatePlatformCanvas(16, 16, true));
+  PlatformCanvas& canvas = *holder.get();
 
   // Make a layer and fill it completely to make sure that the bounds are
   // correct.
@@ -297,7 +300,8 @@
 // Test that translation + make layer works properly.
 TEST(PlatformCanvas, TranslateLayer) {
   // Create the canvas initialized to opaque white.
-  PlatformCanvas canvas(16, 16, true);
+  SkAutoTUnref<PlatformCanvas> holder(CreatePlatformCanvas(16, 16, true));
+  PlatformCanvas& canvas = *holder.get();
 
   // Make a layer and fill it completely to make sure that the bounds are
   // correct.