Remove TabContents from constrained windows.

chrome/browser/ui/cocoa/constrained_window/constrained_window_mac2.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_UI_COCOA_CONSTRAINED_WINDOW_CONSTRAINED_WINDOW_MAC_2_
 #define CHROME_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_CONSTRAINED_WINDOW_MAC_2_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "chrome/browser/ui/constrained_window.h"
 
-class TabContents;
+namespace content {
+class WebContents;
+}
 
 // Constrained window implementation for Mac.
 class ConstrainedWindowMac2 : public ConstrainedWindow {
  public:
-  ConstrainedWindowMac2(TabContents* tab_contents, NSWindow* window);
+  ConstrainedWindowMac2(content::WebContents* web_contents, NSWindow* window);
 
   // ConstrainedWindow implementation.
   virtual void ShowConstrainedWindow() OVERRIDE;
   // Closes the constrained window and deletes this instance.
   virtual void CloseConstrainedWindow() OVERRIDE;
   virtual void PulseConstrainedWindow() OVERRIDE;
   virtual gfx::NativeWindow GetNativeWindow() OVERRIDE;
   virtual bool CanShowConstrainedWindow() OVERRIDE;
 
  private:
   virtual ~ConstrainedWindowMac2();
 
   // Gets the parent window of the dialog.
   NSWindow* GetParentWindow() const;
 
-  TabContents* tab_contents_;  // weak
+  // The WebContents that owns and constrains this ConstrainedWindow. Weak.
+  content::WebContents* web_contents_;
+
   scoped_nsobject<NSWindow> window_;
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_CONSTRAINED_WINDOW_MAC_2_