chrome: Cleanup class/struct forward declarations

chrome/browser/ui/cocoa/infobars/infobar_container_controller.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_INFOBARS_INFOBAR_CONTAINER_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_INFOBARS_INFOBAR_CONTAINER_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
 
 #include "base/mac/scoped_nsobject.h"
 #import "chrome/browser/ui/cocoa/view_resizer.h"
 
 @class BrowserWindowController;
 @class InfoBarController;
 class InfoBarCocoa;
 class InfoBarContainerCocoa;
-class TabStripModel;
 
 namespace content {
 class WebContents;
 }
 
-namespace infobars {
-class InfoBarDelegate;
-}
-
 // Protocol for basic container methods, as needed by an InfoBarController.
 // This protocol exists to make mocking easier in unittests.
 @protocol InfoBarContainerControllerBase
 - (BOOL)shouldSuppressTopInfoBarTip;
 - (CGFloat)infobarArrowX;
 @end
 
 // Controller for the infobar container view, which is the superview
 // of all the infobar views.  This class owns zero or more
 // InfoBarControllers, which manage the infobar views.  This class
@@ skipping 54 matching lines @@
 
 // Set the max arrow height of the top infobar.
 - (void)setMaxTopArrowHeight:(NSInteger)height;
 
 // The height of all the info bars. Does not include the top arrow.
 - (CGFloat)heightOfInfoBars;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_INFOBARS_INFOBAR_CONTAINER_CONTROLLER_H_