[Extensions] Don't allow extensions to inject scripts into extension pages

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 0cd225083878cd30e4da3ec5b5e27547716264bc..23cb833f8a0542ba3b7f4ccea6a8df9044ca103c 100644
--- a/extensions/renderer/user_script_set.cc
+++ b/extensions/renderer/user_script_set.cc
@@ -211,7 +211,7 @@ scoped_ptr<ScriptInjection> UserScriptSet::GetInjectionForScript(
   if (injector->CanExecuteOnFrame(
           injection_host.get(),
           web_frame,
-          -1 /* Content scripts are not tab-specific. */) ==
+          tab_id) ==
       PermissionsData::ACCESS_DENIED) {
     return injection.Pass();
   }
@@ -225,8 +225,7 @@ scoped_ptr<ScriptInjection> UserScriptSet::GetInjectionForScript(
         injector.Pass(),
         render_frame,
         injection_host.Pass(),
-        run_location,
-        tab_id));
+        run_location));
   }
   return injection.Pass();
 }