Reviewed by Maciej Stachowiak.
        
        - Fixed loader crash by clarifying ownership of WebKit client objects. 
        WebCore objects own their WebKit clients, and ref and deref through 
        virtual methods, leaving WebKit free to use whatever client / reference-counting 
        implementation it likes.
        
        * WebCore.exp:
        * WebCore.xcodeproj/project.pbxproj:
        * bridge/EditorClient.h: Fixed up function prototypes for style.
        * loader/FrameLoader.cpp: Removed detachFrameLoader, since its real purpose
        was to implement an alternative ownership model.
        (WebCore::FrameLoader::~FrameLoader): Removed empty destructor.
        (WebCore::FrameLoader::setClient): This function now takes ownership
        (WebCore::FrameLoader::client):
        * loader/FrameLoader.h:
        * loader/FrameLoaderClient.h:
        * page/ChromeClient.h:
        * platform/AbstractShared.h: Added. This is the virtual function-based refcounting
        complement to Shared.
        (WebCore::AbstractShared::~AbstractShared):

WebKit:

        Reviewed by Maciej Stachowiak.
        
        - Fixed loader crash by clarifying ownership of WebKit client objects. 
        WebCore objects own their WebKit clients, and ref and deref through 
        virtual methods, leaving WebKit free to use whatever client / reference-counting 
        implementation it likes.
        
        WebKit on Mac just uses the same refcounting class that WebCore uses (Shared),
        but other platforms may choose to do other things.

        * WebCoreSupport/WebChromeClient.h:
        (WebChromeClient::ref):
        (WebChromeClient::deref):
        (WebChromeClient::refCount):
        * WebCoreSupport/WebEditorClient.h: Nixed commented-out function prototypes.
        The ones in WebCore make clear what remains to be implemented. Replaced constructor
        with factory function to avoid leaks.
        * WebCoreSupport/WebEditorClient.mm:
        (WebEditorClient::create):
        (WebEditorClient::WebEditorClient):
        (WebEditorClient::setWebFrame):
        * WebCoreSupport/WebFrameBridge.mm:
        (-[WebFrameBridge initMainFrameWithPage:WebCore::frameName:view:webView:]):
        (-[WebFrameBridge initSubframeWithOwnerElement:frameName:view:]):
        * WebCoreSupport/WebFrameLoaderClient.h: Replaced constructor with factory
        function to avoid leaks.
        (WebFrameLoaderClient::ref):
        (WebFrameLoaderClient::deref):
        (WebFrameLoaderClient::refCount):
        * WebCoreSupport/WebFrameLoaderClient.mm:
        (WebFrameLoaderClient::create):
        * WebView/WebFrame.mm:
        (-[WebFrame _initWithWebFrameView:webView:coreFrame:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17740 268f45cc-cd09-0410-ab3c-d52691b4dbfc