Mac: Remove the workaround to prevent "Share" dialogs disappearing the browser.

chrome/browser/ui/cocoa/info_bubble_window.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/info_bubble_window.h"
 
 #include <Carbon/Carbon.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 229 matching lines @@
 // window.
 - (void)sendEvent:(NSEvent*)theEvent {
   if (!closing_)
     [super sendEvent:theEvent];
 }
 
 - (BOOL)isClosing {
   return closing_;
 }
 
-// Override -[NSWindow addChildWindow] to prevent ShareKit bugs propagating
-// to the browser window. See http://crbug.com/475855.
-- (void)addChildWindow:(NSWindow*)childWindow
-               ordered:(NSWindowOrderingMode)orderingMode {
-  [[self parentWindow] removeChildWindow:self];
-  [super addChildWindow:childWindow ordered:orderingMode];
-}
-
 @end