Reviewed by Ken and Maciej.

    Reviewed by Ken and Maciej.

        - fixed <rdar://problem/4049040> REGRESSION (403-405): security check prevents user stylesheet from loading (Dictionary.app doesn't work at all!)

        * Plugins.subproj/WebNetscapePluginStream.m: (-[WebNetscapePluginStream initWithRequest:pluginPointer:notifyData:sendNotification:]):
        Allow plug-in subresource streams to load with any URL, ignoring the "canLoadURL" method's restriction (only
        file URLs can load other file URLs), which now applies only to main resources, like web pages in frames or
        object tags and plug-in main resources.

        * WebCoreSupport.subproj/WebBridge.m:
        (-[WebBridge startLoadingResource:withURL:customHeaders:]): Allow subresources to load with any URL, as above.
        This allows things like images, stylesheets, and JavaScript to be loaded without the "canLoadURL" method's
        restriction.
        (-[WebBridge startLoadingResource:withURL:customHeaders:postData:]): Ditto.
        (-[WebBridge syncLoadResourceWithURL:customHeaders:postData:finalURL:responseHeaders:statusCode:]): Ditto.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8874 268f45cc-cd09-0410-ab3c-d52691b4dbfc