chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/extension_action.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "chrome/common/extensions/api/extension_action/action_info.h"
 #include "extensions/common/constants.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/image/image.h"
 
 class GURL;
 
 namespace extensions {
 class Extension;
 class IconImage;
 }
 
 namespace gfx {
-class Canvas;
 class Image;
 class ImageSkia;
-class Rect;
-class Size;
 }
 
 // ExtensionAction encapsulates the state of a browser action or page action.
 // Instances can have both global and per-tab state. If a property does not have
 // a per-tab value, the global value is used instead.
 class ExtensionAction {
  public:
   // The action that the UI should take after the ExtensionAction is clicked.
   enum ShowAction {
     ACTION_NONE,
@@ skipping 262 matching lines @@
 };
 
 template<>
 struct ExtensionAction::ValueTraits<int> {
   static int CreateEmpty() {
     return -1;
   }
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_H_