Switch Extensions::TabHelper to use WebContents, WebContentsUserData.

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index c22cda6c51a1d936ec30055cf9feb65a6ad90b7f..9c31248f60e98362f8ad700a218d867416b243d3 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -1015,12 +1015,12 @@ bool CanViewSource(const Browser* browser) {
 
 void CreateApplicationShortcuts(Browser* browser) {
   content::RecordAction(UserMetricsAction("CreateShortcut"));
-  GetActiveTabContents(browser)->extension_tab_helper()->
+  extensions::TabHelper::FromWebContents(GetActiveWebContents(browser))->
       CreateApplicationShortcuts();
 }
 
 bool CanCreateApplicationShortcuts(const Browser* browser) {
-  return GetActiveTabContents(browser)->extension_tab_helper()->
+  return extensions::TabHelper::FromWebContents(GetActiveWebContents(browser))->
       CanCreateApplicationShortcuts();
 }