cc: Remove the unused function appendCompositingItem with 3 parameters

cc/blink/web_display_item_list_impl.h

Index: cc/blink/web_display_item_list_impl.h
diff --git a/cc/blink/web_display_item_list_impl.h b/cc/blink/web_display_item_list_impl.h
index 2bb1b90b7ff72e01975f2c4d70d13422d93a29ab..abaf221bba24491f41241360c459488c4cd1d200 100644
--- a/cc/blink/web_display_item_list_impl.h
+++ b/cc/blink/web_display_item_list_impl.h
@@ -8,10 +8,7 @@
 #include "base/memory/ref_counted.h"
 #include "cc/blink/cc_blink_export.h"
 #include "cc/resources/display_item_list.h"
-#include "third_party/WebKit/public/platform/WebBlendMode.h"
-#include "third_party/WebKit/public/platform/WebContentLayerClient.h"
 #include "third_party/WebKit/public/platform/WebDisplayItemList.h"
-#include "third_party/WebKit/public/platform/WebFloatPoint.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/core/SkXfermode.h"
@@ -24,6 +21,12 @@ class SkPath;
 class SkPicture;
 class SkRRect;
 
+namespace blink {
+class WebFilterOperations;
+struct WebFloatRect;
+struct WebRect;
+}
+
 namespace cc_blink {
 
 class WebDisplayItemListImpl : public blink::WebDisplayItemList {
@@ -47,10 +50,6 @@ class WebDisplayItemListImpl : public blink::WebDisplayItemList {
   virtual void appendEndFloatClipItem();
   virtual void appendTransformItem(const SkMatrix44& matrix);
   virtual void appendEndTransformItem();
-  // TODO(pdr): Remove this once the blink-side callers have been removed.
-  virtual void appendCompositingItem(float opacity,
-                                     SkXfermode::Mode,
-                                     SkColorFilter*);
   virtual void appendCompositingItem(float opacity,
                                      SkXfermode::Mode,
                                      SkRect* bounds,