(DO NOT LAND) Revert of Generate StyleBackgroundData in ComputedStyleBase.

third_party/WebKit/Source/core/style/ComputedStyle.h

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index 77c3d775e6028dac29d47d1b77f050c05da7b302..713fd153ca572892b6552669c0cf2c884ade7e3b 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -181,10 +181,40 @@
   friend class StyleResolverState;
   friend class StyleResolver;
 
+ private:
+  class StyleBackgroundData : public RefCountedCopyable<StyleBackgroundData> {
+   public:
+    static PassRefPtr<StyleBackgroundData> Create() {
+      return AdoptRef(new StyleBackgroundData);
+    }
+    PassRefPtr<StyleBackgroundData> Copy() const {
+      return AdoptRef(new StyleBackgroundData(*this));
+    }
+
+    bool operator==(const StyleBackgroundData& other) const {
+      return background_ == other.background_ &&
+             background_color_ == other.background_color_;
+    }
+    bool operator!=(const StyleBackgroundData& other) const {
+      return !(*this == other);
+    }
+
+    FillLayer background_;
+    StyleColor background_color_;
+
+   private:
+    StyleBackgroundData()
+        : background_(FillLayer(kBackgroundFillLayer, true)),
+          background_color_(Color::kTransparent) {}
+
+    StyleBackgroundData(const StyleBackgroundData&) = default;
+  };
+
  protected:
   // non-inherited attributes
   DataRef<StyleBoxData> box_data_;
   DataRef<StyleVisualData> visual_data_;
+  DataRef<StyleBackgroundData> background_data_;
   DataRef<StyleRareNonInheritedData> rare_non_inherited_data_;
 
   // inherited attributes