Fix panels being removed from PanelManager prematurely.

content/public/browser/notification_types.h

Index: content/public/browser/notification_types.h
diff --git a/content/public/browser/notification_types.h b/content/public/browser/notification_types.h
index 1d6e50352e035801e37aeb684a2c665afd99cb62..6c8aa2424c60b8a953477463a6a05f73326be8bc 100644
--- a/content/public/browser/notification_types.h
+++ b/content/public/browser/notification_types.h
@@ -351,6 +351,10 @@ enum NotificationType {
   // Note: Used only in testing.
   NOTIFICATION_RENDER_VIEW_HOST_DID_RECEIVE_DRAG_TARGET_DROP_ACK,
 
+  // Sent from RenderViewHost::OnMsgShouldCloseACK. This means handling
+  // ViewMsg_ShouldClose has been completed and result received.
+  NOTIFICATION_RENDER_VIEW_HOST_RECEIVED_ON_MSG_SHOULD_CLOSE_ACK,

[jam, 2011/11/11 21:19:19]

notifications, in general, are a hacky way of getting some code to call another
part of code. in this case, it might be used by a test only, but then later
others might use it as well and refactoring that code which sends it becomes
complicated.

are there are no other existing notifications or callbacks that you can reuse
here?

+
   // Indicates a RenderWidgetHost has been hidden or restored. The source is
   // the RWH whose visibility changed, the details is a bool set to true if
   // the new state is "visible."