Remove unused FillLayer::ContainsImage()

Bug: 781461
Change-Id: I464ad57e04ad5047dc034f42dc9befd30696f940
Reviewed-on: https://chromium-review.googlesource.com/1080363Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563157}

third_party/blink/renderer/core/style/fill_layer.cc

@@ -364,16 +364,6 @@ bool FillLayer::ClipOccludesNextLayers() const {
   return Clip() == ThisOrNextLayersClipMax();
 }
 
-bool FillLayer::ContainsImage(StyleImage* s) const {
-  if (!s)
-    return false;
-  if (image_ && *s == *image_)
-    return true;
-  if (next_)
-    return next_->ContainsImage(s);
-  return false;
-}
-
 bool FillLayer::ImagesAreLoaded() const {
   const FillLayer* curr;
   for (curr = this; curr; curr = curr->Next()) {

third_party/blink/renderer/core/style/fill_layer.h

@@ -214,7 +214,6 @@ class CORE_EXPORT FillLayer {
 
   bool VisuallyEqual(const FillLayer&) const;
 
-  bool ContainsImage(StyleImage*) const;
   bool ImagesAreLoaded() const;
 
   bool HasImage() const {