Add explicit base namespace to string16 users.

chrome/common/chrome_content_client_ios.mm

 // Copyright 2012 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/chrome_content_client.h"
 
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/url_constants.h"
@@ skipping 35 matching lines @@
   std::string product("CriOS/");
   product += version_info.is_valid() ? version_info.Version() : "0.0.0.0";
   return product;
 }
 
 std::string ChromeContentClient::GetUserAgent() const {
   std::string product = GetProduct();
   return webkit_glue::BuildUserAgentFromProduct(product);
 }
 
-string16 ChromeContentClient::GetLocalizedString(int message_id) const {
+base::string16 ChromeContentClient::GetLocalizedString(int message_id) const {
   return l10n_util::GetStringUTF16(message_id);
 }
 
 base::StringPiece ChromeContentClient::GetDataResource(
     int resource_id,
     ui::ScaleFactor scale_factor) const {
   return ResourceBundle::GetSharedInstance().GetRawDataResourceForScale(
       resource_id, scale_factor);
 }
 
 base::RefCountedStaticMemory* ChromeContentClient::GetDataResourceBytes(
     int resource_id) const {
   return ResourceBundle::GetSharedInstance().LoadDataResourceBytes(resource_id);
 }
 
 gfx::Image& ChromeContentClient::GetNativeImageNamed(int resource_id) const {
   return ResourceBundle::GetSharedInstance().GetNativeImageNamed(resource_id);
 }
 
 std::string ChromeContentClient::GetProcessTypeNameInEnglish(int type) {
   DCHECK(false) << "Unknown child process type!";
   return "Unknown"; 
 }