Reviewed by Yury Semikhatsky.

        Web Inspector: move Database and DOMStorage related things from InspectorAgent to the corresponding agents.

        https://bugs.webkit.org/show_bug.cgi?id=54455

        Some set of instrumentation calls should work even if we have no InspectorFrontend instance and corresponding agents.
        At the moment we are using InspectorAgent instance for such calls.

        * inspector/InspectorAgent.cpp:
        (WebCore::InspectorAgent::InspectorAgent):
        (WebCore::InspectorAgent::createFrontendLifetimeAgents):
        (WebCore::InspectorAgent::pushDataCollectedOffline):
        (WebCore::InspectorAgent::didCommitLoad):
        * inspector/InspectorAgent.h:
        (WebCore::InspectorOfflineResourcesBase::~InspectorOfflineResourcesBase):
        (WebCore::InspectorOfflineResourcesBase::InspectorOfflineResourcesBase):
        (WebCore::InspectorAgent::databaseAgentResources):
        (WebCore::InspectorAgent::domStorageAgentResources):
        * inspector/InspectorDOMStorageAgent.cpp:
        (WebCore::InspectorDOMStorageAgent::Resources::clear):
        (WebCore::InspectorDOMStorageAgent::Resources::pushDataCollectedOffline):
        (WebCore::InspectorDOMStorageAgent::InspectorDOMStorageAgent):
        (WebCore::InspectorDOMStorageAgent::~InspectorDOMStorageAgent):
        (WebCore::InspectorDOMStorageAgent::createOfflineStorage):
        (WebCore::InspectorDOMStorageAgent::selectDOMStorage):
        (WebCore::InspectorDOMStorageAgent::getDOMStorageResourceForId):
        (WebCore::InspectorDOMStorageAgent::didUseDOMStorage):
        * inspector/InspectorDOMStorageAgent.h:
        (WebCore::InspectorDOMStorageAgent::create):
        * inspector/InspectorDatabaseAgent.cpp:
        (WebCore::InspectorDatabaseAgent::Resources::clear):
        (WebCore::InspectorDatabaseAgent::Resources::pushDataCollectedOffline):
        (WebCore::InspectorDatabaseAgent::didOpenDatabase):
        (WebCore::InspectorDatabaseAgent::InspectorDatabaseAgent):
        (WebCore::InspectorDatabaseAgent::createOfflineStorage):
        (WebCore::InspectorDatabaseAgent::databaseForId):
        (WebCore::InspectorDatabaseAgent::selectDatabase):
        * inspector/InspectorDatabaseAgent.h:
        (WebCore::InspectorDatabaseAgent::create):
        * inspector/InspectorInstrumentation.cpp:
        (WebCore::InspectorInstrumentation::didOpenDatabaseImpl):
        (WebCore::InspectorInstrumentation::didUseDOMStorageImpl):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@78692 268f45cc-cd09-0410-ab3c-d52691b4dbfc