[Extensions] Use document url (not top url) for tab-specific permissions

extensions/renderer/user_script_set.cc

Index: extensions/renderer/user_script_set.cc
diff --git a/extensions/renderer/user_script_set.cc b/extensions/renderer/user_script_set.cc
index 01e8a5a2e682887f24c136dc1fedaa99f7b6fc05..864840fd55f1a290c8c0476a8e71e3ad5e8eec00 100644
--- a/extensions/renderer/user_script_set.cc
+++ b/extensions/renderer/user_script_set.cc
@@ -222,9 +222,10 @@ scoped_ptr<ScriptInjection> UserScriptSet::GetInjectionForScript(
   if (top_frame->isWebRemoteFrame())
     return injection.Pass();
 
-  if (injector->CanExecuteOnFrame(injection_host.get(), web_frame,
-                                  -1,  // Content scripts are not tab-specific.
-                                  top_frame->document().url()) ==
+  if (injector->CanExecuteOnFrame(
+          injection_host.get(),
+          web_frame,
+          -1 /* Content scripts are not tab-specific. */) ==
       PermissionsData::ACCESS_DENIED) {
     return injection.Pass();
   }