Add explicit base namespace to string16 users.

chrome/common/extensions/api/spellcheck/spellcheck_handler.cc

 // Copyright (c) 2013 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 "chrome/common/extensions/api/spellcheck/spellcheck_handler.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "extensions/common/manifest_constants.h"
 
 namespace extensions {
 
 namespace keys = manifest_keys;
 namespace errors = manifest_errors;
 
 SpellcheckDictionaryInfo::SpellcheckDictionaryInfo() {
 }
 
 SpellcheckDictionaryInfo::~SpellcheckDictionaryInfo() {
 }
 
 SpellcheckHandler::SpellcheckHandler() {
 }
 
 SpellcheckHandler::~SpellcheckHandler() {
 }
 
-bool SpellcheckHandler::Parse(Extension* extension, string16* error) {
+bool SpellcheckHandler::Parse(Extension* extension, base::string16* error) {
   const base::DictionaryValue* spellcheck_value = NULL;
   if (!extension->manifest()->GetDictionary(keys::kSpellcheck,
                                             &spellcheck_value)) {
     *error = ASCIIToUTF16(errors::kInvalidSpellcheck);
     return false;
   }
   scoped_ptr<SpellcheckDictionaryInfo> spellcheck_info(
       new SpellcheckDictionaryInfo);
   if (!spellcheck_value->HasKey(keys::kSpellcheckDictionaryLanguage) ||
       !spellcheck_value->GetString(keys::kSpellcheckDictionaryLanguage,
@@ skipping 21 matching lines @@
   }
   extension->SetManifestData(keys::kSpellcheck, spellcheck_info.release());
   return true;
 }
 
 const std::vector<std::string> SpellcheckHandler::Keys() const {
   return SingleKey(keys::kSpellcheck);
 }
 
 }  // namespace extensions