Mac: Make bubble windows (not their controller) responsible for calling removeChildWindow

chrome/browser/ui/cocoa/base_bubble_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
@@ skipping 184 matching lines @@
   }
   if (resignationObserver_) {
     [[NSNotificationCenter defaultCenter]
         removeObserver:resignationObserver_
                   name:NSWindowDidResignKeyNotification
                 object:nil];
     resignationObserver_ = nil;
   }
 
   tabStripObserverBridge_.reset();
-
-  NSWindow* window = [self window];
-  [[window parentWindow] removeChildWindow:window];
 }
 
 - (void)windowWillClose:(NSNotification*)notification {
   [self closeCleanup];
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [self autorelease];
 }
 
 // We want this to be a child of a browser window.  addChildWindow:
 // (called from this function) will bring the window on-screen;
@@ skipping 163 matching lines @@
 
 - (void)activateTabWithContents:(content::WebContents*)newContents
                previousContents:(content::WebContents*)oldContents
                         atIndex:(NSInteger)index
                          reason:(int)reason {
   // The user switched tabs; close.
   [self close];
 }
 
 @end  // BaseBubbleController