https://bugs.webkit.org/show_bug.cgi?id=100325

Reviewed by Anders Carlsson.

Make DownloadProxy, WebPageProxy, and WebPageGroupProxy MessageReceivers.

* UIProcess/Downloads/DownloadProxy.cpp:
(WebKit::DownloadProxy::DownloadProxy):
(WebKit::DownloadProxy::invalidate):
(WebKit::DownloadProxy::didReceiveMessage):
(WebKit::DownloadProxy::didReceiveSyncMessage):
* UIProcess/Downloads/DownloadProxy.h:
(DownloadProxy):
Make a MessageReceiver.

* UIProcess/WebContext.cpp:
(WebKit::WebContext::WebContext):
(WebKit::WebContext::addMessageReceiver):
(WebKit::WebContext::removeMessageReceiver):
(WebKit::WebContext::didReceiveMessage):
(WebKit::WebContext::didReceiveSyncMessage):
* UIProcess/WebContext.h:
Add additional MessageReceiverMap forwards, and stop dealing with DownloadProxy explicitly.
        
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::WebPageProxy):
(WebKit::WebPageProxy::~WebPageProxy):
(WebKit::WebPageProxy::didReceiveMessage):
(WebKit::WebPageProxy::didReceiveSyncMessage):
* UIProcess/WebPageProxy.h:
Make a MessageReceiver, but keep sub objects using didReceiveMessage for now (like WebPage).
        
* UIProcess/WebProcessProxy.cpp:
(WebKit::WebProcessProxy::addMessageReceiver):
(WebKit::WebProcessProxy::removeMessageReceiver):
(WebKit::WebProcessProxy::didReceiveMessage):
(WebKit::WebProcessProxy::didReceiveSyncMessage):
* UIProcess/WebProcessProxy.h:
Give WebProcessProxy a MessageReceiverMap and all the appropriate forwarding methods.
        
* WebProcess/WebPage/WebPageGroupProxy.cpp:
(WebKit::WebPageGroupProxy::WebPageGroupProxy):
(WebKit::WebPageGroupProxy::~WebPageGroupProxy):
(WebKit::WebPageGroupProxy::didReceiveMessage):
* WebProcess/WebPage/WebPageGroupProxy.h:
(WebKit::WebPageGroupProxy::isVisibleToHistoryClient):
(WebPageGroupProxy):
Make a MessageReceiver and register/unregister with the WebProcess.

* WebProcess/WebProcess.cpp:
(WebKit::WebProcess::didReceiveSyncMessage):
Remove extraneous return statement.
(WebKit::WebProcess::didReceiveMessage):
Stop handling WebPageGroupProxy special.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132740 268f45cc-cd09-0410-ab3c-d52691b4dbfc