Get rid of content::NavigationController in cc file and use "using" instead.

chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 
 #include "base/memory/scoped_nsobject.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/renderer_host/render_widget_host_view.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 
+using content::NavigationController;
 using content::WebContents;
 
 @interface TabContentsController(Private)
 // Forwards frame update to |delegate_| (ResizeNotificationView calls it).
 - (void)tabContentsViewFrameWillChange:(NSRect)frameRect;
 // Notification from TabContents (forwarded by TabContentsNotificationBridge).
 - (void)tabContentsRenderViewHostChanged:(RenderViewHost*)oldHost
                                  newHost:(RenderViewHost*)newHost;
 @end
 
@@ skipping 33 matching lines @@
     NOTREACHED();
   }
 }
 
 void TabContentsNotificationBridge::ChangeWebContents(WebContents* contents) {
   registrar_.RemoveAll();
   if (contents) {
     registrar_.Add(
         this,
         content::NOTIFICATION_RENDER_VIEW_HOST_CHANGED,
-        content::Source<content::NavigationController>(
-            &contents->GetController()));
+        content::Source<NavigationController>(&contents->GetController()));
   }
 }
 
 
 // A custom view that notifies |controller| that view's frame is changing.
 
 @interface ResizeNotificationView : NSView {
   TabContentsController* controller_;
 }
 - (id)initWithController:(TabContentsController*)controller;
@@ skipping 122 matching lines @@
   // the view may have, so avoid changing the view hierarchy unless
   // the view is different.
   if ([self tabContents] != updatedContents) {
     [self changeTabContents:updatedContents];
     if ([self tabContents])
       [self ensureContentsVisible];
   }
 }
 
 @end