Add base:: to string16 in extensions/.

extensions/common/manifest_handlers/incognito_info.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 "extensions/common/manifest_handlers/incognito_info.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "extensions/common/extension.h"
@@ skipping 16 matching lines @@
       extension->GetManifestData(keys::kIncognito));
   return info ? info->split_mode : false;
 }
 
 IncognitoHandler::IncognitoHandler() {
 }
 
 IncognitoHandler::~IncognitoHandler() {
 }
 
-bool IncognitoHandler::Parse(Extension* extension, string16* error) {
+bool IncognitoHandler::Parse(Extension* extension, base::string16* error) {
   if (!extension->manifest()->HasKey(keys::kIncognito)) {
     // Extensions and Chrome apps default to spanning mode.
     // Hosted and legacy packaged apps default to split mode.
     extension->SetManifestData(
         keys::kIncognito,
         new IncognitoInfo(extension->is_hosted_app() ||
                           extension->is_legacy_packaged_app()));
     return true;
   }
 
@@ skipping 19 matching lines @@
 
 bool IncognitoHandler::AlwaysParseForType(Manifest::Type type) const {
   return true;
 }
 
 const std::vector<std::string> IncognitoHandler::Keys() const {
   return SingleKey(keys::kIncognito);
 }
 
 }  // namespace extensions