Add StringView constructor that takes a ref to save a branch in CSSTokenizerInputStream::rangeAt

third_party/WebKit/Source/core/css/parser/CSSTokenizerInputStream.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSTokenizerInputStream.h"
 
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/html/parser/InputStreamPreprocessor.h"
 #include "wtf/text/StringToNumber.h"
 
@@ skipping 36 matching lines @@
     if (start < end) {
         if (m_string->is8Bit())
             result = charactersToDouble(m_string->characters8() + m_offset + start, end - start, &isResultOK);
         else
             result = charactersToDouble(m_string->characters16() + m_offset + start, end - start, &isResultOK);
     }
     // FIXME: It looks like callers ensure we have a valid number
     return isResultOK ? result : 0.0;
 }
 
-StringView CSSTokenizerInputStream::rangeAt(unsigned start, unsigned length) const
-{
-    DCHECK(start + length <= m_stringLength);
-    return StringView(m_string.get(), start, length);
-}
-
 } // namespace blink