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

chrome/browser/ui/snapshot_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/snapshot_tab_helper.h"
 
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/render_messages.h"
-#include "content/browser/tab_contents/tab_contents.h"
 #include "content/public/browser/notification_service.h"
+#include "content/public/browser/web_contents.h"
 
 using content::WebContents;
 
 SnapshotTabHelper::SnapshotTabHelper(WebContents* tab)
     : content::WebContentsObserver(tab) {
 }
 
 SnapshotTabHelper::~SnapshotTabHelper() {
 }
 
@@ skipping 12 matching lines @@
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Internal helpers
 
 void SnapshotTabHelper::OnSnapshot(const SkBitmap& bitmap) {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_TAB_SNAPSHOT_TAKEN,
-      content::Source<WebContents>(tab_contents()),
+      content::Source<WebContents>(web_contents()),
       content::Details<const SkBitmap>(&bitmap));
 }