Remove unneeded TabContents::FromWebContents.

chrome/browser/sessions/tab_restore_service_helper.cc

 // 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.
 
 #include "chrome/browser/sessions/tab_restore_service_helper.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/logging.h"
@@ skipping 377 matching lines @@
         controller->GetPendingEntry() : controller->GetEntryAtIndex(i);
     tab->navigations[i] =
         TabNavigation::FromNavigationEntry(i, *entry);
   }
   tab->timestamp = TimeNow();
   tab->current_navigation_index = controller->GetCurrentEntryIndex();
   if (tab->current_navigation_index == -1 && entry_count > 0)
     tab->current_navigation_index = 0;
   tab->tabstrip_index = index;
 
-  TabContents* tab_contents =
-      TabContents::FromWebContents(controller->GetWebContents());
-  // tab_contents is NULL in some browser tests.
-  if (tab_contents) {
+  extensions::TabHelper* extensions_tab_helper =
+      extensions::TabHelper::FromWebContents(controller->GetWebContents());
+  // extensions_tab_helper is NULL in some browser tests.
+  if (extensions_tab_helper) {
     const extensions::Extension* extension =
-        extensions::TabHelper::FromWebContents(controller->GetWebContents())->
-            extension_app();
+        extensions_tab_helper->extension_app();
     if (extension)
       tab->extension_app_id = extension->id();
   }
 
   tab->user_agent_override =
       controller->GetWebContents()->GetUserAgentOverride();
 
   // TODO(ajwong): This does not correctly handle storage for isolated apps.
   tab->session_storage_namespace =
       controller->GetDefaultSessionStorageNamespace();
@@ skipping 138 matching lines @@
       Tab* tab = static_cast<Tab*>(entry);
       if (tab->browser_id == old_id)
         tab->browser_id = new_id;
     }
   }
 }
 
 base::Time TabRestoreServiceHelper::TimeNow() const {
   return time_factory_ ? time_factory_->TimeNow() : base::Time::Now();
 }