Remove duplicated headers from core/

Source/core/workers/WorkerRunLoop.cpp

 /*
  * Copyright (C) 2009 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 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.
  */
 
 #include "config.h"
 #include "core/workers/WorkerRunLoop.h"
 
-#include "core/dom/ExecutionContext.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerThread.h"
 #include "platform/PlatformThreadData.h"
 #include "platform/SharedTimer.h"
 #include "platform/ThreadTimers.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
 
@@ skipping 224 matching lines @@
 {
     return m_messageQueue.append(Task::create(task, mode.isolatedCopy()));
 }
 
 bool WorkerRunLoop::postTaskForMode(const Closure& closure, const String& mode)
 {
     return postTaskForMode(CallClosureTask::create(closure), mode);
 }
 
 } // namespace WebCore