Remove unused includes from various .cpp files in core/

Source/core/loader/cache/CachedTextTrack.cpp

 /*
  * Copyright (C) 2011 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 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/loader/cache/CachedTextTrack.h"
 
-#include "core/loader/TextResourceDecoder.h"
 #include "core/loader/cache/CachedResourceClient.h"
 #include "core/loader/cache/CachedResourceClientWalker.h"
-#include "core/loader/cache/CachedResourceLoader.h"
-#include "core/platform/SharedBuffer.h"
 #include <wtf/Vector.h>
 
 namespace WebCore {
 
 CachedTextTrack::CachedTextTrack(const ResourceRequest& resourceRequest)
     : CachedResource(resourceRequest, TextTrackResource)
 {
 }
 
 CachedTextTrack::~CachedTextTrack()
 {
 }
 
 void CachedTextTrack::appendData(const char* data, int length)
 {
     CachedResource::appendData(data, length);
     CachedResourceClientWalker<CachedResourceClient> walker(m_clients);
     while (CachedResourceClient *client = walker.next())
         client->deprecatedDidReceiveCachedResource(this);
 }
 
 }