Reviewed by Dimitri Glazkov.

        [V8] Refactored V8 event listeners:
        (This change should fix http://crbug.com/21079 and
        https://bugs.webkit.org/show_bug.cgi?id=29093.)
         o All listeners use weak handles to JS objects to avoid creating
           cycles and leaking memory.
         o "Object" variants of listeners removed.
         o All event accessor callbacks are generated.
         o Custom event accessors removed.
         o All wrappers have hidden dependencies on their listeners to
           prevent listeners from being collected.
         o All variats of getEventListener function grouped in V8DOMWrapper.
         o Pointers to C++ EventListener wrappers are stored in JS objects
           instead of event listener lists.
        https://bugs.webkit.org/show_bug.cgi?id=29825

        * WebCore.gypi: Removed "Object" listeners.
        * bindings/scripts/CodeGeneratorV8.pm: Now handles event accessors.
        * bindings/v8/DOMObjectsInclude.h:

        V8AbstractEventListener manages weak JS handle:
        * bindings/v8/V8AbstractEventListener.cpp:
        (WebCore::weakEventListenerCallback):
        (WebCore::V8AbstractEventListener::V8AbstractEventListener):
        (WebCore::V8AbstractEventListener::~V8AbstractEventListener):
        (WebCore::V8AbstractEventListener::handleEvent):
        (WebCore::V8AbstractEventListener::disposeListenerObject):
        (WebCore::V8AbstractEventListener::setListenerObject):
        * bindings/v8/V8AbstractEventListener.h:
        (WebCore::V8AbstractEventListener::cast):
        (WebCore::V8AbstractEventListener::isLazy):
        (WebCore::V8AbstractEventListener::getListenerObject):
        (WebCore::V8AbstractEventListener::getExistingListenerObject):
        (WebCore::V8AbstractEventListener::hasExistingListenerObject):
        (WebCore::V8AbstractEventListener::disconnectFrame):
        (WebCore::V8AbstractEventListener::disconnected):
        (WebCore::V8AbstractEventListener::prepareListenerObject):
        (WebCore::V8AbstractEventListener::lineNumber):
        (WebCore::V8AbstractEventListener::virtualisAttribute):

        Grouped getEventListener functions:
        * bindings/v8/V8DOMWrapper.cpp:
        (WebCore::V8DOMWrapper::getTemplate):
        (WebCore::V8DOMWrapper::getEventListener):
        * bindings/v8/V8DOMWrapper.h:

        Removed most event listener objects bookkeeping:
        * bindings/v8/V8EventListenerList.cpp:
        * bindings/v8/V8EventListenerList.h:
        (WebCore::V8EventListenerList::findWrapper):
        (WebCore::V8EventListenerList::clearWrapper):
        (WebCore::V8EventListenerList::doFindWrapper):
        (WebCore::V8EventListenerList::getHiddenProperty):
        (WebCore::V8EventListenerList::findOrCreateWrapper):

        Added hidden properties for storing EventListener wrappers:
        * bindings/v8/V8HiddenPropertyName.cpp:
        (WebCore::V8HiddenPropertyName::listener):
        (WebCore::V8HiddenPropertyName::attributeListener):
        * bindings/v8/V8HiddenPropertyName.h:

        * bindings/v8/V8LazyEventListener.cpp:
        (WebCore::V8LazyEventListener::V8LazyEventListener):
        (WebCore::V8LazyEventListener::callListenerFunction):
        (WebCore::V8LazyEventListener::prepareListenerObject):
        * bindings/v8/V8LazyEventListener.h:
        (WebCore::V8LazyEventListener::isLazy):
        * bindings/v8/V8ObjectEventListener.cpp: Removed.
        * bindings/v8/V8ObjectEventListener.h: Removed.
        * bindings/v8/V8Proxy.cpp:
        (WebCore::V8Proxy::disconnectFrame):
        (WebCore::V8Proxy::disconnectEventListeners):
        * bindings/v8/V8Proxy.h:
        * bindings/v8/V8WorkerContextEventListener.cpp:
        (WebCore::V8WorkerContextEventListener::reportError):
        (WebCore::V8WorkerContextEventListener::getReceiverObject):
        * bindings/v8/V8WorkerContextEventListener.h:
        * bindings/v8/V8WorkerContextObjectEventListener.cpp: Removed.
        * bindings/v8/V8WorkerContextObjectEventListener.h: Removed.
        * bindings/v8/WorkerContextExecutionProxy.cpp:
        (WebCore::WorkerContextExecutionProxy::dispose):
        (WebCore::WorkerContextExecutionProxy::initContextIfNeeded):
        (WebCore::WorkerContextExecutionProxy::findOrCreateEventListener):
        * bindings/v8/WorkerContextExecutionProxy.h:
        * bindings/v8/custom/V8AbstractWorkerCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8CustomBinding.h:
        * bindings/v8/custom/V8CustomEventListener.cpp:
        (WebCore::V8EventListener::V8EventListener):
        (WebCore::V8EventListener::getListenerFunction):
        (WebCore::V8EventListener::callListenerFunction):
        * bindings/v8/custom/V8CustomEventListener.h:
        * bindings/v8/custom/V8DOMApplicationCacheCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8DOMWindowCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8DedicatedWorkerContextCustom.cpp:
        * bindings/v8/custom/V8MessagePortCustom.cpp:
        (WebCore::getEventListener):
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8NodeCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8NotificationCenterCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8SVGElementInstanceCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8WebSocketCustom.cpp:
        * bindings/v8/custom/V8WorkerContextCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8WorkerCustom.cpp:
        * bindings/v8/custom/V8XMLHttpRequestConstructor.cpp:
        * bindings/v8/custom/V8XMLHttpRequestCustom.cpp:
        (WebCore::CALLBACK_FUNC_DECL):
        * bindings/v8/custom/V8XMLHttpRequestUploadCustom.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@48978 268f45cc-cd09-0410-ab3c-d52691b4dbfc