- fix <rdar://problem/5318732> REGRESSION: In Mail, a crash occurs when attempting to send
          a HTML based message (nytimes.com, washingtonpost.com, latimes.com)

        Did an audit of calls to get the inspector and most other uses of Page* and added null
        checks since Frame* can outlast its Page*.

        * loader/FrameLoader.cpp:
        (WebCore::FrameLoader::createWindow): Added null check.
        (WebCore::FrameLoader::loadSubframe): Ditto.
        (WebCore::FrameLoader::load): Ditto.
        (WebCore::FrameLoader::transitionToCommitted): Ditto.
        (WebCore::FrameLoader::checkLoadCompleteForThisFrame): Ditto.
        (WebCore::FrameLoader::continueLoadAfterWillSubmitForm): Ditto.
        (WebCore::FrameLoader::addExtraFieldsToRequest): Ditto.
        (WebCore::FrameLoader::loadResourceSynchronously): Ditto.
        (WebCore::FrameLoader::continueLoadAfterNavigationPolicy): Ditto.
        (WebCore::FrameLoader::requestFromDelegate): Ditto.
        (WebCore::FrameLoader::canGoBackOrForward): Ditto.
        (WebCore::FrameLoader::getHistoryLength): Ditto.
        (WebCore::FrameLoader::historyURL): Ditto.
        (WebCore::FrameLoader::cachePageForHistoryItem): Ditto.
        (WebCore::FrameLoader::addBackForwardItemClippedAtTarget): Ditto.
        (WebCore::FrameLoader::goToItem): Ditto.
        (WebCore::FrameLoader::dispatchWindowObjectAvailable): Ditto.
        (WebCore::FrameLoader::dispatchDidCommitLoad): Ditto.
        (WebCore::FrameLoader::dispatchAssignIdentifierToInitialRequest): Ditto.
        (WebCore::FrameLoader::dispatchWillSendRequest): Ditto.
        (WebCore::FrameLoader::dispatchDidReceiveResponse): Ditto.
        (WebCore::FrameLoader::dispatchDidReceiveContentLength): Ditto.
        (WebCore::FrameLoader::dispatchDidFinishLoading): Ditto.
        (WebCore::FrameLoader::dispatchDidLoadResourceFromMemoryCache): Ditto.

        * page/ContextMenuController.h:
        * page/ContextMenuController.cpp:
        (WebCore::ContextMenuController::ContextMenuController): Removed unneeded and
        unused Page* parameter.
        (WebCore::openNewWindow): Added null check.
        (WebCore::ContextMenuController::contextMenuItemSelected): Ditto.

        * page/InspectorController.h:
        (WebCore::InspectorController::pageDestroyed): Added. Since this object is
        owned by the Page and has a back-pointer to it, it needs an explicit disconnect.
        There's already a higher-level one, but this is more reliable than that.
        * page/InspectorController.cpp:
        (WebCore::InspectorController::windowScriptObjectAvailable): Added null check.
        (WebCore::InspectorController::windowUnloading): Ditto.

        * page/Page.cpp:
        (WebCore::Page::Page): Updated for change in parameters of ContextMenuController 
        constructor.
        (WebCore::Page::~Page): Added call to InspectorController pageDestroyed().

        * page/Chrome.cpp: Updated includes.
        * page/DragController.cpp: Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@24156 268f45cc-cd09-0410-ab3c-d52691b4dbfc