Reduce usage of WebString::data

Tools/DumpRenderTree/chromium/TestRunner/src/SpellCheckClient.cpp

 /*
  * Copyright (C) 2013 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 67 matching lines @@
 {
     // Check the spelling of the given text.
     m_spellcheck.spellCheckWord(text, &misspelledOffset, &misspelledLength);
 }
 
 void SpellCheckClient::checkTextOfParagraph(const WebString& text, WebTextCheckingTypeMask mask, WebVector<WebTextCheckingResult>* webResults)
 {
     vector<WebTextCheckingResult> results;
     if (mask & WebTextCheckingTypeSpelling) {
         size_t offset = 0;
-        size_t length = text.length();
-        const WebUChar* data = text.data();
-        while (offset < length) {
+        string16 data = text;
+        while (offset < data.length()) {
             int misspelledPosition = 0;
             int misspelledLength = 0;
-            m_spellcheck.spellCheckWord(WebString(&data[offset], length - offset), &misspelledPosition, &misspelledLength);
+            m_spellcheck.spellCheckWord(data.substr(offset), &misspelledPosition, &misspelledLength);
             if (!misspelledLength)
                 break;
             WebTextCheckingResult result;
             result.type = WebTextCheckingTypeSpelling;
             result.location = offset + misspelledPosition;
             result.length = misspelledLength;
             results.push_back(result);
             offset += misspelledPosition + misspelledLength;
         }
     }
@@ skipping 47 matching lines @@
 WebString SpellCheckClient::autoCorrectWord(const WebString&)
 {
     // Returns an empty string as Mac WebKit ('WebKitSupport/WebEditorClient.mm')
     // does. (If this function returns a non-empty string, WebKit replaces the
     // given misspelled string with the result one. This process executes some
     // editor commands and causes layout-test failures.)
     return WebString();
 }
 
 }