Reviewed by Darin.
    
        more fast teardown performance work

        * Misc/WebDownload.m:
        (-[WebDownloadInternal downloadDidBegin:]):
        (-[WebDownloadInternal downloadDidFinish:]):
        (-[WebDownloadInternal download:didFailWithError:]):
        * WebCoreSupport/WebChromeClient.h:
        * WebCoreSupport/WebChromeClient.mm:
        (WebChromeClient::disableSuddenTermination):
        (WebChromeClient::enableSuddenTermination):

        more fast teardown performance work, WebCore plumbing

        * page/Chrome.cpp:
        (WebCore::Chrome::disableSuddenTermination):
        (WebCore::Chrome::enableSuddenTermination):
        (WebCore::ChromeClient::disableSuddenTermination):
        (WebCore::ChromeClient::enableSuddenTermination):
        * page/Chrome.h:
        * page/ChromeClient.h:
        * page/Page.cpp:
        (WebCore::Page::changePendingUnloadEventCount):
        (WebCore::Page::changePendingBeforeUnloadEventCount):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@33585 268f45cc-cd09-0410-ab3c-d52691b4dbfc