Move StyleBackgroundData.cpp to be inline in StyleBackgroundData.h

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

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 28 matching lines @@
 class CORE_EXPORT 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&) const;
-  bool operator!=(const StyleBackgroundData& o) const { return !(*this == o); }
+  bool operator==(const StyleBackgroundData& other) const {
+    return background_ == other.background_ &&
+           background_color_ == other.background_color_;
+  }
+  bool operator!=(const StyleBackgroundData& other) const {
+    return !(*this == other);
+  }
 
  private:
   friend class ComputedStyle;
 
-  StyleBackgroundData();
+  StyleBackgroundData()
+      : background_(FillLayer(kBackgroundFillLayer, true)),
+        background_color_(Color::kTransparent) {}
+
   StyleBackgroundData(const StyleBackgroundData&) = default;
 
   FillLayer background_;
   StyleColor background_color_;
 };
 
 }  // namespace blink
 
 #endif  // StyleBackgroundData_h