Switch Extensions::TabHelper to use WebContents, WebContentsUserData.

chrome/browser/ui/views/location_bar/location_bar_view.cc

Index: chrome/browser/ui/views/location_bar/location_bar_view.cc
diff --git a/chrome/browser/ui/views/location_bar/location_bar_view.cc b/chrome/browser/ui/views/location_bar/location_bar_view.cc
index a2a2e3d8a52ee207557fef61c5315a690bb5ac4f..ee8fdbece3c785fdbb9d04d7a5e0b76df5632efc 100644
--- a/chrome/browser/ui/views/location_bar/location_bar_view.cc
+++ b/chrome/browser/ui/views/location_bar/location_bar_view.cc
@@ -1151,10 +1151,12 @@ void LocationBarView::RefreshPageActionViews() {
 
   std::vector<ExtensionAction*> new_page_actions;
 
-  TabContents* tab_contents = GetTabContents();
-  if (tab_contents) {
+  WebContents* contents = GetWebContentsFromDelegate(delegate_);
+  if (contents) {
+    extensions::TabHelper* extensions_tab_helper =
+        extensions::TabHelper::FromWebContents(contents);
     extensions::LocationBarController* controller =
-        tab_contents->extension_tab_helper()->location_bar_controller();
+        extensions_tab_helper->location_bar_controller();
     new_page_actions = controller->GetCurrentActions();
   }
 
@@ -1180,7 +1182,6 @@ void LocationBarView::RefreshPageActionViews() {
     }
   }
 
-  WebContents* contents = GetWebContentsFromDelegate(delegate_);
   if (!page_action_views_.empty() && contents) {
     Browser* browser = browser::FindBrowserWithWebContents(contents);
     GURL url = chrome::GetActiveWebContents(browser)->GetURL();