GitLab

        Reviewed by Oliver Hunt.

        Invalidate callbacks if the WebPageProxy is no longer valid
        https://bugs.webkit.org/show_bug.cgi?id=57873
        <rdar://problem/9059717>

        Audit all function calls that take callbacks and make sure to invalidate the callbacks
        if the web page is no longer valid.

        * UIProcess/WebPageProxy.cpp:
        (WebKit::WebPageProxy::runJavaScriptInMainFrame):
        (WebKit::WebPageProxy::getRenderTreeExternalRepresentation):
        (WebKit::WebPageProxy::getSourceForFrame):
        (WebKit::WebPageProxy::getContentsAsString):
        (WebKit::WebPageProxy::getSelectionOrContentsAsString):
        (WebKit::WebPageProxy::getMainResourceDataOfFrame):
        (WebKit::WebPageProxy::getResourceDataFromFrame):
        (WebKit::WebPageProxy::getWebArchiveOfFrame):
        (WebKit::WebPageProxy::forceRepaint):
        (WebKit::WebPageProxy::computePagesForPrinting):
        (WebKit::WebPageProxy::drawRectToPDF):
        (WebKit::WebPageProxy::drawPagesToPDF):


git-svn-id: svn://svn.chromium.org/blink/trunk@82970 bbb929c8-8fbe-4397-9dbb-9b2b20218538