Add explicit base namespace to string16 users.

chrome/common/extensions/api/sockets/sockets_manifest_handler.cc

 // Copyright 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/sockets/sockets_manifest_handler.h"
 
 #include "chrome/common/extensions/api/sockets/sockets_manifest_data.h"
 #include "chrome/common/extensions/api/sockets/sockets_manifest_permission.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest_constants.h"
 
 namespace extensions {
 
 SocketsManifestHandler::SocketsManifestHandler() {}
 
 SocketsManifestHandler::~SocketsManifestHandler() {}
 
-bool SocketsManifestHandler::Parse(Extension* extension, string16* error) {
+bool SocketsManifestHandler::Parse(Extension* extension,
+                                   base::string16* error) {
   const base::Value* sockets = NULL;
   CHECK(extension->manifest()->Get(manifest_keys::kSockets, &sockets));
   scoped_ptr<SocketsManifestData> data =
       SocketsManifestData::FromValue(*sockets, error);
   if (!data)
     return false;
 
   extension->SetManifestData(manifest_keys::kSockets, data.release());
   return true;
 }
 
 ManifestPermission* SocketsManifestHandler::CreatePermission() {
   return new SocketsManifestPermission();
 }
 
 ManifestPermission* SocketsManifestHandler::CreateInitialRequiredPermission(
     const Extension* extension) {
   SocketsManifestData* data = SocketsManifestData::Get(extension);
   if (data)
     return data->permission()->Clone();
   return NULL;
 }
 
 const std::vector<std::string> SocketsManifestHandler::Keys() const {
   return SingleKey(manifest_keys::kSockets);
 }
 
 }  // namespace extensions