Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/ui/constrained_window_tab_helper.cc

 // 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.
 
 #include "chrome/browser/ui/constrained_window_tab_helper.h"
 
 #include "chrome/browser/ui/constrained_window.h"
 #include "chrome/browser/ui/constrained_window_tab_helper_delegate.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/render_messages.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/navigation_details.h"
+#include "content/browser/tab_contents/tab_contents.h"
 #include "net/base/registry_controlled_domain.h"
 
 ConstrainedWindowTabHelper::ConstrainedWindowTabHelper(
     TabContentsWrapper* wrapper)
     : TabContentsObserver(wrapper->tab_contents()),
       wrapper_(wrapper),
       delegate_(NULL) {
 }
 
 ConstrainedWindowTabHelper::~ConstrainedWindowTabHelper() {
@@ skipping 76 matching lines @@
   }
 }
 
 void ConstrainedWindowTabHelper::TabContentsDestroyed(TabContents* tab) {
   // First cleanly close all child windows.
   // TODO(mpcomplete): handle case if MaybeCloseChildWindows() already asked
   // some of these to close.  CloseWindows is async, so it might get called
   // twice before it runs.
   CloseConstrainedWindows();
 }