Reviewed by Sam Weinig.

        WebKit side of <rdar://problem/6656147>.
        
        * Plugins/Hosted/NetscapePluginHostManager.mm:
        (WebKit::NetscapePluginHostManager::instantiatePlugin):
        Pass the requestID to _WKPHInstantiatePlugin.
        
        * Plugins/Hosted/NetscapePluginHostProxy.mm:
        Pass the requestID to setCurrentReply.
        
        * Plugins/Hosted/NetscapePluginInstanceProxy.h:
        (WebKit::NetscapePluginInstanceProxy::setCurrentReply):
        Store the reply in a map with the requestID as the key.
        
        (WebKit::NetscapePluginInstanceProxy::waitForReply):
        Wait for a reply that matches the given requestID.
        
        * Plugins/Hosted/NetscapePluginInstanceProxy.mm:
        (WebKit::NetscapePluginInstanceProxy::NetscapePluginInstanceProxy):
        Initialize member variables.
        
        (WebKit::NetscapePluginInstanceProxy::~NetscapePluginInstanceProxy):
        Delete all requests.
        
        (WebKit::NetscapePluginInstanceProxy::print):
        Pass the requestID to _WKPHPluginInstancePrint.
        
        (WebKit::NetscapePluginInstanceProxy::loadRequest):
        Rename m_currentRequestID to m_currentURLRequestID.
        
        (WebKit::NetscapePluginInstanceProxy::processRequestsAndWaitForReply):
        Process requests until we find a reply with the right requestID.
        
        (WebKit::NetscapePluginInstanceProxy::createBindingsInstance):
        Pass a requestID to the _WKPH function.
        
        (WebKit::NetscapePluginInstanceProxy::nextRequestID):
        Ditto.
        
        * Plugins/Hosted/ProxyInstance.mm:
        Pass a requestID to the _WKPH functions.
        
        * Plugins/Hosted/WebKitPluginClient.defs:
        * Plugins/Hosted/WebKitPluginHost.defs:
        Add requestID parameters.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41597 268f45cc-cd09-0410-ab3c-d52691b4dbfc