Rename FeatureObserver to UseCounter to make clear that all it stores are usage counts.

Source/WebCore/workers/SharedWorker.cpp

 /*
  * Copyright (C) 2009 Google Inc. 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 18 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #if ENABLE(SHARED_WORKERS)
 
 #include "SharedWorker.h"
 
 #include "ExceptionCode.h"
-#include "FeatureObserver.h"
+#include "UseCounter.h"
 #include "InspectorInstrumentation.h"
 #include "KURL.h"
 #include "MessageChannel.h"
 #include "MessagePort.h"
 #include "ScriptExecutionContext.h"
 #include "SecurityOrigin.h"
 #include "SharedWorkerRepository.h"
 
 namespace WebCore {
 
 inline SharedWorker::SharedWorker(ScriptExecutionContext* context)
     : AbstractWorker(context)
 {
 }
 
 PassRefPtr<SharedWorker> SharedWorker::create(ScriptExecutionContext* context, const String& url, const String& name, ExceptionCode& ec)
 {
     ASSERT(isMainThread());
-    FeatureObserver::observe(static_cast<Document*>(context)->domWindow(), FeatureObserver::SharedWorkerStart);
+    UseCounter::observe(static_cast<Document*>(context)->domWindow(), UseCounter::SharedWorkerStart);
 
     RefPtr<SharedWorker> worker = adoptRef(new SharedWorker(context));
 
     RefPtr<MessageChannel> channel = MessageChannel::create(context);
     worker->m_port = channel->port1();
     OwnPtr<MessagePortChannel> remotePort = channel->port2()->disentangle();
     ASSERT(remotePort);
 
     worker->suspendIfNeeded();
 
@@ skipping 19 matching lines @@
 }
 
 const AtomicString& SharedWorker::interfaceName() const
 {
     return eventNames().interfaceForSharedWorker;
 }
 
 } // namespace WebCore
 
 #endif  // ENABLE(SHARED_WORKERS)