Remove uses of skia::ReadPixels(PaintCanvas)

ui/gfx/color_utils_unittest.cc

Index: ui/gfx/color_utils_unittest.cc
diff --git a/ui/gfx/color_utils_unittest.cc b/ui/gfx/color_utils_unittest.cc
index 8e3df50936cf881db143dddad0515b2c48a84248..367029f9a0c7eb24e3e55284c172fbcf95afac9b 100644
--- a/ui/gfx/color_utils_unittest.cc
+++ b/ui/gfx/color_utils_unittest.cc
@@ -128,7 +128,7 @@ TEST(ColorUtils, CalculateBoringScore_SingleColor) {
   // Fill all pixels in black.
   canvas.FillRect(gfx::Rect(kSize), SK_ColorBLACK);
 
-  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());
+  SkBitmap bitmap = canvas.ToBitmap();
   // The thumbnail should deserve the highest boring score.
   EXPECT_DOUBLE_EQ(1.0, CalculateBoringScore(bitmap));
 }
@@ -143,7 +143,7 @@ TEST(ColorUtils, CalculateBoringScore_TwoColors) {
   canvas.FillRect(gfx::Rect(0, 0, kSize.width() / 2, kSize.height()),
                   SK_ColorWHITE);
 
-  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());
+  SkBitmap bitmap = canvas.ToBitmap();
   ASSERT_EQ(kSize.width(), bitmap.width());
   ASSERT_EQ(kSize.height(), bitmap.height());
   // The thumbnail should be less boring because two colors are used.