Clean up some dead code accidentally left around in cc DisplayItem subtypes.

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2025893003
Cr-Commit-Position: refs/heads/master@{#396935}

cc/playback/clip_display_item.h

@@ -64,7 +64,6 @@ class CC_EXPORT EndClipDisplayItem : public DisplayItem {
   size_t ExternalMemoryUsage() const override;
 
   int ApproximateOpCount() const { return 0; }
-  bool IsSuitableForGpuRasterization() const { return true; }
 };
 
 }  // namespace cc

cc/playback/clip_path_display_item.h

@@ -67,7 +67,6 @@ class CC_EXPORT EndClipPathDisplayItem : public DisplayItem {
   size_t ExternalMemoryUsage() const override;
 
   int ApproximateOpCount() const { return 0; }
-  bool IsSuitableForGpuRasterization() const { return true; }
 };
 
 }  // namespace cc

cc/playback/compositing_display_item.h

@@ -82,7 +82,6 @@ class CC_EXPORT EndCompositingDisplayItem : public DisplayItem {
   size_t ExternalMemoryUsage() const override;
 
   int ApproximateOpCount() const { return 0; }
-  bool IsSuitableForGpuRasterization() const { return true; }
 };
 
 }  // namespace cc

cc/playback/filter_display_item.h

@@ -66,7 +66,6 @@ class CC_EXPORT EndFilterDisplayItem : public DisplayItem {
   size_t ExternalMemoryUsage() const override;
 
   int ApproximateOpCount() const { return 0; }
-  bool IsSuitableForGpuRasterization() const { return true; }
 };
 
 }  // namespace cc

cc/playback/float_clip_display_item.h

@@ -65,7 +65,6 @@ class CC_EXPORT EndFloatClipDisplayItem : public DisplayItem {
   size_t ExternalMemoryUsage() const override;
 
   int ApproximateOpCount() const { return 0; }
-  bool IsSuitableForGpuRasterization() const { return true; }
 };
 
 }  // namespace cc

cc/playback/transform_display_item.h

@@ -64,7 +64,6 @@ class CC_EXPORT EndTransformDisplayItem : public DisplayItem {
   size_t ExternalMemoryUsage() const override;
 
   int ApproximateOpCount() const { return 0; }
-  bool IsSuitableForGpuRasterization() const { return true; }
 };
 
 }  // namespace cc