Remove unused includes from various .cpp files in core/

Source/core/loader/cache/CachedResourceRequest.cpp

 /*
  * Copyright (C) 2012 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:
  * 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 GOOGLE INC. ``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 COMPUTER, INC. OR
  * 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/CachedResourceRequest.h"
 
-#include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/loader/cache/CachedResourceLoader.h"
 
 namespace WebCore {
 
 CachedResourceRequest::CachedResourceRequest(const ResourceRequest& resourceRequest, const AtomicString& initiator, const String& charset, ResourceLoadPriority priority)
     : m_resourceRequest(resourceRequest)
     , m_charset(charset)
     , m_options(CachedResourceLoader::defaultCachedResourceOptions())
     , m_priority(priority)
@@ skipping 21 matching lines @@
     , m_defer(NoDefer)
 {
     m_initiatorInfo.name = initiator;
 }
 
 CachedResourceRequest::~CachedResourceRequest()
 {
 }
 
 } // namespace WebCore