Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/task_manager/task_manager_notification_browsertest.cc

 // Copyright (c) 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/browser/task_manager/task_manager.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/notifications/desktop_notification_service.h"
@@ skipping 44 matching lines @@
   // Show the task manager.
   chrome::ShowTaskManager(browser());
   // Expect to see the browser and the New Tab Page renderer.
   TaskManagerBrowserTestUtil::WaitForWebResourceChange(1);
 
   // Show a notification.
   NotificationUIManager* notifications =
       g_browser_process->notification_ui_manager();
 
   base::string16 content = DesktopNotificationService::CreateDataUrl(
-      GURL(), ASCIIToUTF16("Hello World!"), base::string16(),
+      GURL(), base::ASCIIToUTF16("Hello World!"), base::string16(),
       blink::WebTextDirectionDefault);
 
   scoped_refptr<NotificationDelegate> del1(new MockNotificationDelegate("n1"));
   Notification n1(
-      GURL(), GURL(content), ASCIIToUTF16("Test 1"), base::string16(),
+      GURL(), GURL(content), base::ASCIIToUTF16("Test 1"), base::string16(),
       del1.get());
   scoped_refptr<NotificationDelegate> del2(new MockNotificationDelegate("n2"));
   Notification n2(
-      GURL(), GURL(content), ASCIIToUTF16("Test 2"), base::string16(),
+      GURL(), GURL(content), base::ASCIIToUTF16("Test 2"), base::string16(),
       del2.get());
 
   notifications->Add(n1, browser()->profile());
   TaskManagerBrowserTestUtil::WaitForWebResourceChange(2);
   notifications->Add(n2, browser()->profile());
   TaskManagerBrowserTestUtil::WaitForWebResourceChange(3);
   notifications->CancelById(n1.notification_id());
   TaskManagerBrowserTestUtil::WaitForWebResourceChange(2);
   notifications->CancelById(n2.notification_id());
   TaskManagerBrowserTestUtil::WaitForWebResourceChange(1);
 }