color: Remove blink pre-conversion code

third_party/WebKit/Source/platform/graphics/PlaceholderImage.h

Index: third_party/WebKit/Source/platform/graphics/PlaceholderImage.h
diff --git a/third_party/WebKit/Source/platform/graphics/PlaceholderImage.h b/third_party/WebKit/Source/platform/graphics/PlaceholderImage.h
index de2f0b7487a0fe8bf405175f37fc54a7ea0019ff..7494be609582db4bbb57afe2abfeab5845d61af3 100644
--- a/third_party/WebKit/Source/platform/graphics/PlaceholderImage.h
+++ b/third_party/WebKit/Source/platform/graphics/PlaceholderImage.h
@@ -37,8 +37,7 @@ class PLATFORM_EXPORT PlaceholderImage final : public Image {
             const FloatRect& destRect,
             const FloatRect& srcRect,
             RespectImageOrientationEnum,
-            ImageClampingMode,
-            const ColorBehavior&) override;
+            ImageClampingMode) override;
 
   void destroyDecodedData() override;