Move StyleBackgroundData.cpp to be inline in StyleBackgroundData.h

This patch removes StyleBackgroundData.cpp, and moves all its contents
to be inline in StyleBackgroundData.h

This is prework for generating StyleBackgroundData.

BUG=628043

Review-Url: https://codereview.chromium.org/2860663002
Cr-Commit-Position: refs/heads/master@{#468937}

third_party/WebKit/Source/core/style/BUILD.gn

@@ -55,7 +55,6 @@ blink_core_sources("rendering") {
     "ShadowData.h",
     "ShadowList.cpp",
     "ShadowList.h",
-    "StyleBackgroundData.cpp",
     "StyleBackgroundData.h",
     "StyleBoxData.cpp",
     "StyleBoxData.h",

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

-/*
- * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
- * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
- *
- * 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
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#include "core/style/StyleBackgroundData.h"
-
-#include "core/style/ComputedStyle.h"
-#include "core/style/ComputedStyleConstants.h"
-
-namespace blink {
-
-StyleBackgroundData::StyleBackgroundData()
-    : background_(FillLayer(kBackgroundFillLayer, true)),
-      background_color_(Color::kTransparent) {}
-
-bool StyleBackgroundData::operator==(const StyleBackgroundData& other) const {
-  return background_ == other.background_ &&
-         background_color_ == other.background_color_;
-}
-
-}  // namespace blink

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

@@ -46,13 +46,21 @@ class CORE_EXPORT StyleBackgroundData
     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_;