[Mac] Inform reference counted objects that hold a weak Browser* when the Browser is being destroye…

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

 // Copyright 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/overlayable_contents_controller.h"
 
-#include "content/public/browser/web_contents.h"
-
 @implementation OverlayableContentsController
 
-- (id)initWithBrowser:(Browser*)browser {
+- (id)init {
   if ((self = [super init])) {
     base::scoped_nsobject<NSView> view(
         [[NSView alloc] initWithFrame:NSZeroRect]);
     [view setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable];
     [self setView:view];
 
     activeContainer_.reset([[NSView alloc] initWithFrame:NSZeroRect]);
     [activeContainer_ setAutoresizingMask:NSViewHeightSizable |
                                           NSViewWidthSizable];
     [view addSubview:activeContainer_];
   }
   return self;
 }
 
 - (NSView*)activeContainer {
   return activeContainer_.get();
 }
 
 @end