Combine click policy and URL policy into navigation policy.

        * WebView.subproj/WebControllerPolicyDelegate.h:
        * WebView.subproj/WebDefaultPolicyDelegate.h:
        * WebView.subproj/WebDefaultPolicyDelegate.m:
        (-[WebDefaultPolicyDelegate navigationPolicyForAction:andRequest:inFrame:]):
        * WebView.subproj/WebFramePrivate.h:
        * WebView.subproj/WebFramePrivate.m:
        (-[WebFrame _shouldShowRequest:]):
        (-[WebFrame _actionInformationForNavigationType:event:]):
        (-[WebFrame _continueAfterFileURLPolicyForRequest:]):
        (-[WebFrame _continueAfterNavigationPolicyForRequest:event:]):
        (-[WebFrame _loadURL:loadType:clientRedirect:triggeringEvent:]):

WebBrowser:

	Combined click policy and URL policy into navigation policy.

        * BrowserDocument.m:
        (-[BrowserDocument goToRequest:]):
        * BrowserWebController.m:
        (-[BrowserWebController navigationPolicyForAction:andRequest:inFrame:]):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2651 268f45cc-cd09-0410-ab3c-d52691b4dbfc