<rdar://problem/5267992>
        Make sure an alert doesn't allow loading to continue inside a script.
        
        Make sure to defer all loads where it's possible for a second main loop to be running.
        
        * page/Chrome.cpp:
        (WebCore::Chrome::runModal):
        (WebCore::Chrome::runBeforeUnloadConfirmPanel):
        (WebCore::Chrome::runJavaScriptAlert):
        (WebCore::Chrome::runJavaScriptConfirm):
        (WebCore::Chrome::runJavaScriptPrompt):
        (WebCore::PageGroupLoadDeferrer::PageGroupLoadDeferrer):
        (WebCore::PageGroupLoadDeferrer::~PageGroupLoadDeferrer):
        
        * platform/network/cf/ResourceHandleCFNet.cpp:
        (WebCore::ResourceHandle::setDefersLoading):
        Implement this.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@23510 268f45cc-cd09-0410-ab3c-d52691b4dbfc