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..cbd945b6b63f45d79f01f6585850f9fd5ef94bc7 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -419,6 +419,13 @@ IPC_MESSAGE_ROUTED3(FrameMsg_JavaScriptExecuteRequest,
                     int,  /* ID */
                     bool  /* if true, a reply is requested */)
 
+// ONLY FOR TESTS: Same as above but adds a fake UserGestureindicator around
+// execution. (crbug.com/408426)
+IPC_MESSAGE_ROUTED3(FrameMsg_JavaScriptExecuteRequestForTests,
+                    base::string16,  /* javascript */
+                    int,  /* ID */
+                    bool  /* if true, a reply is requested */)
+
 // Selects between the given start and end offsets in the currently focused
 // editable field.
 IPC_MESSAGE_ROUTED2(FrameMsg_SetEditableSelectionOffsets,