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

chrome/browser/task_manager/task_manager_notification_browsertest.cc

Index: chrome/browser/task_manager/task_manager_notification_browsertest.cc
diff --git a/chrome/browser/task_manager/task_manager_notification_browsertest.cc b/chrome/browser/task_manager/task_manager_notification_browsertest.cc
index c4cf92a8b424ffb4039ff6aea53acc5c2cda5c2b..c9ee629de203d82b6eacd49358f108062ebefd6f 100644
--- a/chrome/browser/task_manager/task_manager_notification_browsertest.cc
+++ b/chrome/browser/task_manager/task_manager_notification_browsertest.cc
@@ -62,16 +62,16 @@ IN_PROC_BROWSER_TEST_F(TaskManagerNotificationBrowserTest,
       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());