Fixed a number of FIXME's related to notifying plug-ins of loaded pages.

        Reviewed by rjw.

        * Plugins.subproj/WebBaseNetscapePluginStream.h:
		- replaced URL ivar with requestURL and responseURL ivars since we need to pass both to plug-ins
        	- added sendNotification boolean. Relying on notifyData not being NULL was not information to know whether to call NPP_URLNotify or not.
		- added isTerminated boolean because determining whether or not stream.ndata is NULL is not enough to know if the stream has been cancelled.
	* Plugins.subproj/WebBaseNetscapePluginStream.m:
        (+[WebBaseNetscapePluginStream reasonForError:]): new, factored out from receivedError:
        (-[WebBaseNetscapePluginStream initWithRequestURL:pluginPointer:notifyData:sendNotification:]): new
        (-[WebBaseNetscapePluginStream dealloc]): release new ivars
        (-[WebBaseNetscapePluginStream finalize]): added assert
        (-[WebBaseNetscapePluginStream setRequestURL:]): new
        (-[WebBaseNetscapePluginStream setResponseURL:]): new
        (-[WebBaseNetscapePluginStream startStreamResponseURL:expectedContentLength:lastModifiedDate:MIMEType:]): renamed, use responseURL as it basically did before
        (-[WebBaseNetscapePluginStream startStreamWithResponse:]): call renamed method
        (-[WebBaseNetscapePluginStream destroyStream]):
		- do nothing if terminated
		- call NPP_StreamAsFile and NPP_DestroyStream if stream.ndata is not NULL
		- call NPP_URLNotify if sendNotification is YES regardless of value of notifyData
        (-[WebBaseNetscapePluginStream receivedError:]): call reasonForError
        (-[WebBaseNetscapePluginStream deliverData]): use renamed ivar
        * Plugins.subproj/WebBaseNetscapePluginView.h:
		- added observingFrameLoadNotification boolean
		- renamed dictionary ivar to pendingFrameLoads which has WebFrame keys and WebPluginRequest values
        * Plugins.subproj/WebBaseNetscapePluginView.m:
        (-[WebBaseNetscapePluginView addFrameLoadObserver]): new
        (-[WebBaseNetscapePluginView removeFrameLoadObserver]): new
        (-[WebBaseNetscapePluginView stop]): call removeFrameLoadObserver
        (-[WebBaseNetscapePluginView initWithFrame:]): use renamed pendingFrameLoads ivar
        (-[WebBaseNetscapePluginView dealloc]): ditto
        (-[WebBaseNetscapePluginView requestWithURLCString:]): set referrer on the request just as IE does
        (-[WebBaseNetscapePluginView evaluateJavaScriptPluginRequest:]):
		- call NPP_URLNotify depending of value of sendNotification
		- call new init method on WebBaseNetscapePluginStream rather then setting variables individually
        (-[WebBaseNetscapePluginView webFrame:didFinishLoadWithReason:]): new, calls NPP_URLNotify at the right time with the right value
        (-[WebBaseNetscapePluginView webFrame:didFinishLoadWithError:]): new, delegate method called from WebFrame
        (-[WebBaseNetscapePluginView loadPluginRequest:]): call addFrameLoadObserver
        (-[WebBaseNetscapePluginView loadRequest:inTarget:withNotifyData:sendNotification:]): take new sendNotification parameter and pass it
        (-[WebBaseNetscapePluginView getURLNotify:target:notifyData:]): pass YES for sendNotification
        (-[WebBaseNetscapePluginView getURL:target:]): pass NO for sendNotification
        (-[WebBaseNetscapePluginView _postURL:target:len:buf:file:notifyData:sendNotification:allowHeaders:]): take new sendNotification parameter and pass it
        (-[WebBaseNetscapePluginView postURLNotify:target:len:buf:file:notifyData:]): pass YES for sendNotification
        (-[WebBaseNetscapePluginView postURL:target:len:buf:file:]): pass NO for sendNotification
        (-[WebPluginRequest initWithRequest:frameName:notifyData:sendNotification:]): take new sendNotification parameter
        (-[WebPluginRequest sendNotification]): new
        * Plugins.subproj/WebBaseNetscapePluginViewPrivate.h:
        * Plugins.subproj/WebNetscapePluginEmbeddedView.m:
        (-[WebNetscapePluginEmbeddedView didStart]): set referrer on the request just as IE does
        * Plugins.subproj/WebNetscapePluginRepresentation.m:
        (-[WebNetscapePluginRepresentation receivedData:withDataSource:]): set the request URL on the stream
        * Plugins.subproj/WebNetscapePluginStream.h:
        * Plugins.subproj/WebNetscapePluginStream.m:
        (-[WebNetscapePluginStream initWithRequest:pluginPointer:notifyData:sendNotification:]): take new sendNotification parameter and pass it
        (-[WebNetscapePluginStream dealloc]): use renamed ivar
        (-[WebNetscapePluginStream start]): ditto
        * WebView.subproj/WebFrame.m:
        (-[WebFrame _setState:]): removed notification posting code. This was only used by WebBaseNetscapePluginView and it was the wrong notification to send.
        (-[WebFrame _checkLoadCompleteForThisFrame]): call internal load delegate to tell it that the load has finished
        (-[WebFrame _loadItem:withLoadType:]): ditto
        (-[WebFrame _continueFragmentScrollAfterNavigationPolicy:formState:]): ditto
        (-[WebFrame _setInternalLoadDelegate:]): new
        (-[WebFrame _internalLoadDelegate]): new
        * WebView.subproj/WebFrameInternal.h:
        * WebView.subproj/WebFramePrivate.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@7755 268f45cc-cd09-0410-ab3c-d52691b4dbfc