Add explicit base namespace to string16 users.

chrome/common/extensions/manifest_handlers/icons_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/manifest_handlers/icons_handler.h"
 
 #include "base/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 55 matching lines @@
   std::string path = GetIcons(extension).Get(size, match_type);
   return path.empty() ? GURL() : extension->GetResourceURL(path);
 }
 
 IconsHandler::IconsHandler() {
 }
 
 IconsHandler::~IconsHandler() {
 }
 
-bool IconsHandler::Parse(Extension* extension, string16* error) {
+bool IconsHandler::Parse(Extension* extension, base::string16* error) {
   scoped_ptr<IconsInfo> icons_info(new IconsInfo);
   const base::DictionaryValue* icons_dict = NULL;
   if (!extension->manifest()->GetDictionary(keys::kIcons, &icons_dict)) {
     *error = ASCIIToUTF16(manifest_errors::kInvalidIcons);
     return false;
   }
 
   if (!manifest_handler_helpers::LoadIconsFromDictionary(
           icons_dict,
           extension_misc::kExtensionIconSizes,
@@ skipping 15 matching lines @@
       extension,
       IDS_EXTENSION_LOAD_ICON_FAILED,
       error);
 }
 
 const std::vector<std::string> IconsHandler::Keys() const {
   return SingleKey(keys::kIcons);
 }
 
 }  // namespace extensions