Remove unused includes from various .cpp files in core/

Source/core/loader/EmptyClients.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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 10 matching lines @@
  * 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/EmptyClients.h"
 
-#include "core/html/HTMLFormElement.h"
 #include "core/loader/DocumentLoader.h"
-#include "core/loader/FormState.h"
 #include "core/loader/FrameNetworkingContext.h"
 #include "core/page/Frame.h"
 #include "core/platform/DateTimeChooser.h"
-#include "core/platform/FileChooser.h"
 
 #if ENABLE(INPUT_TYPE_COLOR)
 #include "core/platform/ColorChooser.h"
 #endif
 
 namespace WebCore {
 
 void fillWithEmptyClients(Page::PageClients& pageClients)
 {
     static ChromeClient* dummyChromeClient = adoptPtr(new EmptyChromeClient).leakPtr();
@@ skipping 97 matching lines @@
 
 void EmptyEditorClient::registerRedoStep(PassRefPtr<UndoStep>)
 {
 }
 
 void EmptyFrameLoaderClient::didRequestAutocomplete(PassRefPtr<FormState>)
 {
 }
 
 }