Remove unused includes from core/platform .cpp files

Source/core/platform/MIMETypeFromURL.cpp

 /*
  * Copyright (C) 2004, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. 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
@@ skipping 10 matching lines @@
  * 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/platform/MIMETypeFromURL.h"
 
 #include "core/platform/MIMETypeRegistry.h"
-#include "core/platform/text/DecodeEscapeSequences.h"
 
 namespace WebCore {
 
 String mimeTypeFromDataURL(const String& url)
 {
     ASSERT(protocolIs(url, "data"));
     size_t index = url.find(';');
     if (index == notFound)
         index = url.find(',');
     if (index != notFound) {
         if (index > 5)
             return url.substring(5, index - 5).lower();
         return "text/plain"; // Data URLs with no MIME type are considered text/plain.
     }
     return "";
 }
 
 String mimeTypeFromURL(const KURL& url)
 {
     String decodedPath = decodeURLEscapeSequences(url.path());
     String extension = decodedPath.substring(decodedPath.reverseFind('.') + 1);
 
     // We don't use MIMETypeRegistry::getMIMETypeForPath() because it returns "application/octet-stream" upon failure
     return MIMETypeRegistry::getMIMETypeForExtension(extension);
 }
 
 }