CrashTracer: 4800+ crashes in Safari at com.apple.WebKit • WTF::HashTableIterator...
        
Reviewed by Oliver Hunt.

Make RuntimeObjectImp more robust against m_instance being a null (which can happen if an OOP plug-in
crashes while we're calling into it).
        
* bridge/runtime_object.cpp:
(JSC::RuntimeObjectImp::RuntimeObjectImp):
(JSC::RuntimeObjectImp::~RuntimeObjectImp):
(JSC::RuntimeObjectImp::invalidate):
(JSC::RuntimeObjectImp::fallbackObjectGetter):
(JSC::RuntimeObjectImp::fieldGetter):
(JSC::RuntimeObjectImp::methodGetter):
(JSC::RuntimeObjectImp::getOwnPropertySlot):
(JSC::RuntimeObjectImp::getOwnPropertyDescriptor):
(JSC::RuntimeObjectImp::put):
(JSC::RuntimeObjectImp::defaultValue):
(JSC::RuntimeObjectImp::getCallData):
(JSC::RuntimeObjectImp::getConstructData):
(JSC::RuntimeObjectImp::getPropertyNames):
* bridge/runtime_object.h:
(JSC::RuntimeObjectImp::getInternalInstance):

WebKit/mac: <rdar://problem/7007541> 
CrashTracer: 4800+ crashes in Safari at com.apple.WebKit • WTF::HashTableIterator...

Reviewed by Oliver Hunt.

Add null checks for m_instanceProxy (It will be null when a plug-in has crashed).
        
* Plugins/Hosted/ProxyInstance.mm:
(WebKit::ProxyInstance::invoke):
(WebKit::ProxyInstance::supportsInvokeDefaultMethod):
(WebKit::ProxyInstance::supportsConstruct):
(WebKit::ProxyInstance::getPropertyNames):
(WebKit::ProxyInstance::methodsNamed):
(WebKit::ProxyInstance::fieldNamed):
(WebKit::ProxyInstance::fieldValue):
(WebKit::ProxyInstance::setFieldValue):
(WebKit::ProxyInstance::invalidate):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@48492 268f45cc-cd09-0410-ab3c-d52691b4dbfc