chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/window_controller.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_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WINDOW_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/common/extensions/api/tabs.h"
 #include "chrome/common/extensions/api/windows.h"
 
 class Browser;  // TODO(stevenjb) eliminate this dependency.
 class GURL;
 class Profile;
-class SessionID;
 
 namespace base {
 class DictionaryValue;
 }
 
-namespace gfx {
-class Rect;
-}
-
 namespace ui {
 class BaseWindow;
 }
 
 namespace extensions {
 class Extension;
 
 // This API needs to be implemented by any window that might be accessed
 // through chrome.windows or chrome.tabs (e.g. browser windows and panels).
 // Subclasses must add/remove themselves from the WindowControllerList
@@ skipping 72 matching lines @@
  private:
   ui::BaseWindow* window_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowController);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WINDOW_CONTROLLER_H_