Reduce ActiveDOMObjects from core/

third_party/WebKit/Source/core/page/EventSource.h

 /*
  * Copyright (C) 2009, 2012 Ericsson AB. All rights reserved.
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 14 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef EventSource_h
 #define EventSource_h
 
-#include "core/dom/ActiveDOMObject.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
 #include "core/loader/ThreadableLoader.h"
 #include "core/loader/ThreadableLoaderClient.h"
 #include "core/page/EventSourceParser.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "wtf/Forward.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class EventSourceInit;
 class ExceptionState;
 class ResourceResponse;
 
-class CORE_EXPORT EventSource final : public RefCountedGarbageCollectedEventTargetWithInlineData<EventSource>, private ThreadableLoaderClient, public ActiveDOMObject, public EventSourceParser::Client {
+class CORE_EXPORT EventSource final : public RefCountedGarbageCollectedEventTargetWithInlineData<EventSource>, private ThreadableLoaderClient, public ContextLifecycleObserver, public EventSourceParser::Client {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(EventSource);
     USING_GARBAGE_COLLECTED_MIXIN(EventSource);
 public:
     static EventSource* create(ExecutionContext*, const String& url, const EventSourceInit&, ExceptionState&);
     ~EventSource() override;
 
     static const unsigned long long defaultReconnectDelay;
 
     String url() const;
     bool withCredentials() const;
 
     enum State : short {
         CONNECTING = 0,
         OPEN = 1,
         CLOSED = 2
     };
 
     State readyState() const;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(open);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
 
     void close();
 
     const AtomicString& interfaceName() const override;
     ExecutionContext* executionContext() const override;
 
-    // ActiveDOMObject
-    //
-    // Note: suspend() is noop since ScopedPageLoadDeferrer calls
-    // Page::setDefersLoading() and it defers delivery of events from the
-    // loader, and therefore the methods of this class for receiving
-    // asynchronous events from the loader won't be invoked.
-    void stop() override;
+    // Note: We don't need to override suspend() because it is noop since
+    // ScopedPageLoadDeferrer calls Page::setDefersLoading() and it defers
+    // delivery of events from the loader, and therefore the methods of this
+    // class for receiving asynchronous events from the loader won't be invoked.
+    void contextDestroyed() override;
 
     bool hasPendingActivity() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     EventSource(ExecutionContext*, const KURL&, const EventSourceInit&);
 
     void didReceiveResponse(unsigned long, const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) override;
     void didReceiveData(const char*, unsigned) override;
@@ skipping 20 matching lines @@
     RefPtr<ThreadableLoader> m_loader;
     Timer<EventSource> m_connectTimer;
 
     unsigned long long m_reconnectDelay;
     String m_eventStreamOrigin;
 };
 
 } // namespace blink
 
 #endif // EventSource_h