Unregistering and re-registering a user message handler does not work

[Adrian Perez]

User script messages sent with “window.webkit.messageHandlers.<name>.postMessage()”
will not work (i.e. “WebScriptMessageHandler::Client::didPostMessage()” is not called)
after performing the following sequence of operations:

 1. Register a handler with “WebUserContentControllerProxy::addUserScriptMessageHandler()”
 2. Unregister the handler with “WebUserContentControllerProxy::removeUserMessageHandlerForName()”
 3. Register again a handler with the same name as in step (1) using
    “WebUserContentControllerProxy::addUserScriptMessageHandler()”

This probably means that either removing the handler does not do all the cleanup it
should and the logic for installing a handler fails when trying to add one with a
name used previously.

I have found this issue while writing the unit tests for the API of the GTK+
port, being worked in bug #133730

[Carlos Garcia Campos]

This has probably been fixed in r184846, the #ifdefed test cases passes now in current trunk

[Carlos Garcia Campos]

Created attachment 257258 [details]
Patch

[Carlos Garcia Campos]

Committed r187218: <http://trac.webkit.org/changeset/187218>