Remove the use of WebRange in ContentDetector.

third_party/WebKit/Source/web/WebSurroundingText.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
@@ skipping 62 matching lines @@
 size_t WebSurroundingText::startOffsetInTextContent() const
 {
     return m_private->startOffsetInContent();
 }
 
 size_t WebSurroundingText::endOffsetInTextContent() const
 {
     return m_private->endOffsetInContent();
 }
 
-WebRange WebSurroundingText::rangeFromContentOffsets(size_t startOffsetInContent, size_t endOffsetInContent)
-{
-    return m_private->rangeFromContentOffsets(startOffsetInContent, endOffsetInContent);
-}
-
 bool WebSurroundingText::isNull() const
 {
     return !m_private.get();
 }
 
 } // namespace blink