Don't take a fake UGI every time we execute Javascript.

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index d9aca27058cc49c017d423b5357fa2cc16eaa94e..c91a5d4da918e42db60754006801a72a83717e40 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -414,10 +414,12 @@ IPC_MESSAGE_ROUTED1(FrameMsg_CSSInsertRequest,
 // the message FrameHostMsg_JavaScriptExecuteResponse.
 // FrameHostMsg_JavaScriptExecuteResponse is passed the ID parameter so that the
 // host can uniquely identify the request.
-IPC_MESSAGE_ROUTED3(FrameMsg_JavaScriptExecuteRequest,
+IPC_MESSAGE_ROUTED4(FrameMsg_JavaScriptExecuteRequest,
                     base::string16,  /* javascript */
                     int,  /* ID */
-                    bool  /* if true, a reply is requested */)
+                    bool, /* if true, a reply is requested */
+                    bool  /* ONLY FOR TESTS:
+                             if true, a fake UserGestureIndicator is set */)
 
 // Selects between the given start and end offsets in the currently focused
 // editable field.