Remove unused includes from core/html .cpp files

Source/core/html/track/WebVTTParser.cpp

 /*
  * Copyright (C) 2011 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 16 matching lines @@
  * (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/html/track/WebVTTParser.h"
 
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/Text.h"
-#include "core/html/HTMLElement.h"
 #include "core/html/track/WebVTTElement.h"
 #include "core/platform/text/SegmentedString.h"
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 const double secondsPerHour = 3600;
 const double secondsPerMinute = 60;
 const double secondsPerMillisecond = 0.001;
 const double malformedTime = -1;
@@ skipping 520 matching lines @@
     unsigned oldPosition = *position;
     while (*position < length && data[*position] != '\r' && data[*position] != '\n')
         (*position)++;
     String line = String::fromUTF8(data + oldPosition, *position - oldPosition);
     skipLineTerminator(data, length, position);
     return line;
 }
 
 }