Reviewed by Adam.

        Drop logic bindings for WebKit

        * WebCoreSupport/WebDragClient.h: Added.
        * WebCoreSupport/WebDragClient.mm: Added.
        (WebDragClient::WebDragClient):
        (WebDragClient::actionMaskForDrag):
        (WebDragClient::willPerformDragDestinationAction):
          Standard client impl
        * WebCoreSupport/WebFrameBridge.mm:
        (-[WebFrameBridge startDraggingImage:at:operation:event:sourceIsDHTML:DHTMLWroteData:]):
          Updated to use DragController to track drag state
    
        * WebCoreSupport/WebPasteboardHelper.h: Added.
        (WebPasteboardHelper::WebPasteboardHelper):
          A *temporary* Helper class to access NSPasteboard access and 
          manipulation functions present in WebKit
        * WebCoreSupport/WebPasteboardHelper.mm: Added.
        (WebPasteboardHelper::urlFromPasteboard):
        (WebPasteboardHelper::plainTextFromPasteboard):
        (WebPasteboardHelper::fragmentFromPasteboard):
        (WebPasteboardHelper::insertablePasteboardTypes):
          See header comment
        * WebKit.xcodeproj/project.pbxproj:
        * WebView/WebDocumentInternal.h:
          Remove unnecessary protocol
        * WebView/WebFrameView.mm:
        (-[WebFrameView _setDocumentView:]):
          Updating to use DragController to track drag state
        * WebView/WebHTMLView.mm:
        (-[WebHTMLView _startDraggingImage:at:operation:event:sourceIsDHTML:DHTMLWroteData:]):
          ditto
        (-[WebHTMLView dragImage:at:offset:event:pasteboard:source:slideBack:]):
          ditto
        (-[WebHTMLView draggingSourceOperationMaskForLocal:]):
          ditto
        (-[WebHTMLView draggedImage:endedAt:operation:]):
          ditto          
        (-[WebHTMLView _documentFragmentForPasteboard:]):
          Helper method to generate DocumentFragment from NSPasteboard without regressing 
        (-[WebHTMLView _canProcessDragWithDraggingInfo:]):
          Updating to use DragController to track drag state
        (-[WebHTMLView _isMoveDrag:]):
        (-[WebHTMLView _isNSColorDrag:]):
        * WebView/WebHTMLViewInternal.h:
          Removing unnecessary fields and methods
        * WebView/WebView.mm:
        (-[WebViewPrivate dealloc]):
          Remove obsolete ASSERT
        (-[WebView _setInitiatedDrag:]):
          Now passes directly through to DragController
        (-[WebView _commonInitializationWithFrameName:groupName:]):
        (-[WebView _loadingDragOperationForDraggingInfo:]):
          Removed
        (-[WebView draggingEntered:]):
          Updated to use DragController
        (-[WebView draggingUpdated:]):
          ditto
        (-[WebView draggingExited:]):
          ditto
        (-[WebView performDragOperation:]):
          ditto
        (-[WebView _hitTest:dragTypes:]):
        * WebView/WebViewInternal.h:
          remove unnecessary method def



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@19040 268f45cc-cd09-0410-ab3c-d52691b4dbfc