Reviewed by Anders.

    Reviewed by Anders.

        - remove WebKit dependencies from WebPlugInStreamLoader via a protocol veil of ignorance

        * Loader/WebNetscapePlugInStreamLoader.h:
        * Loader/WebNetscapePlugInStreamLoader.m:
        (-[WebNetscapePlugInStreamLoader initWithDelegate:frameLoader:]):
        * Loader/WebPlugInStreamLoaderDelegate.h: Added.
        * Plugins/WebBaseNetscapePluginStream.h:
        * Plugins/WebNetscapePluginStream.m:
        (-[WebNetscapePluginStream initWithRequest:pluginPointer:notifyData:sendNotification:]):
        * WebKit.xcodeproj/project.pbxproj:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15881 268f45cc-cd09-0410-ab3c-d52691b4dbfc