Move StringPiece into the base namespace. It is colliding

chrome/browser/extensions/extensions_ui.cc

 // Copyright (c) 2006-2009 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/browser/extensions/extensions_ui.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/string_util.h"
 #include "base/thread.h"
@@ skipping 30 matching lines @@
 ExtensionsUIHTMLSource::ExtensionsUIHTMLSource()
     : DataSource(chrome::kChromeUIExtensionsHost, MessageLoop::current()) {
 }
 
 void ExtensionsUIHTMLSource::StartDataRequest(const std::string& path,
                                               int request_id) {
   DictionaryValue localized_strings;
   localized_strings.SetString(L"title",
       l10n_util::GetString(IDS_EXTENSIONS_TITLE));
 
-  static const StringPiece extensions_html(
+  static const base::StringPiece extensions_html(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
           IDR_EXTENSIONS_UI_HTML));
   std::string full_html(extensions_html.data(), extensions_html.size());
   jstemplate_builder::AppendJsonHtml(&localized_strings, &full_html);
   jstemplate_builder::AppendI18nTemplateSourceHtml(&full_html);
   jstemplate_builder::AppendI18nTemplateProcessHtml(&full_html);
   jstemplate_builder::AppendJsTemplateSourceHtml(&full_html);
 
   scoped_refptr<RefCountedBytes> html_bytes(new RefCountedBytes);
   html_bytes->data.resize(full_html.size());
@@ skipping 293 matching lines @@
   AddMessageHandler(handler);
   handler->Attach(this);
 
   ExtensionsUIHTMLSource* html_source = new ExtensionsUIHTMLSource();
 
   // Set up the chrome://extensions/ source.
   g_browser_process->io_thread()->message_loop()->PostTask(FROM_HERE,
       NewRunnableMethod(&chrome_url_data_manager,
           &ChromeURLDataManager::AddDataSource, html_source));
 }