chrome: Cleanup class/struct forward declarations

chrome/browser/ui/cocoa/browser_window_utils.h

 // Copyright (c) 2011 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_UI_COCOA_BROWSER_WINDOW_UTILS_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_UTILS_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "chrome/browser/ui/cocoa/themed_window.h"
 
-class Browser;
-
 namespace content {
 struct NativeWebKeyboardEvent;
 }
 
 @interface BrowserWindowUtils : NSObject
 
 // Returns YES if keyboard event should be handled.
 + (BOOL)shouldHandleKeyboardEvent:(const content::NativeWebKeyboardEvent&)event;
 
 // Returns YES if keyboard event is a text editing command such as Copy or Paste
@@ skipping 29 matching lines @@
 // of a theme image should be painted at. This method exists so that the
 // position can be queried by the new tab button before the tab strip is layed
 // out.
 + (NSPoint)themeImagePositionInTabStripCoords:(NSView*)tabStripView
                                     alignment:(ThemeImageAlignment)alignment;
 
 + (void)activateWindowForController:(NSWindowController*)controller;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_UTILS_H_