Move most of the remaining users of WebContentsObserver::tab_contents() to use web_contents().

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"
@@ skipping 52 matching lines @@
   if (child_windows_.empty()) {
     BlockTabContent(false);
   } else {
     if (removed_topmost_window)
       child_windows_[0]->ShowConstrainedWindow();
     BlockTabContent(true);
   }
 }
 
 void ConstrainedWindowTabHelper::BlockTabContent(bool blocked) {
-  TabContents* contents = tab_contents();
+  WebContents* contents = web_contents();
   if (!contents) {
     // The TabContents has already disconnected.
     return;
   }
 
   // RenderViewHost may be NULL during shutdown.
   RenderViewHost* host = contents->GetRenderViewHost();
   if (host) {
     host->set_ignore_input_events(blocked);
     host->Send(
@@ skipping 19 matching lines @@
   }
 }
 
 void ConstrainedWindowTabHelper::WebContentsDestroyed(WebContents* 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();
 }