Add explicit base namespace to string16 users.

chrome/common/time_format_browsertest.cc

 // Copyright (c) 2011 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.
 
 // This whole test runs as a separate browser_test because it depends on a
 // static initialization inside third_party/icu (gDecimal in digitlst.cpp).
 //
 // That initialization depends on the current locale, and on certain locales
 // will lead to wrong behavior. To make sure that the locale is set before
 // icu is used, and that the "wrong" static value doesn't affect other tests,
@@ skipping 16 matching lines @@
   base::ScopedLocale scoped_locale_;
 };
 
 IN_PROC_BROWSER_TEST_F(TimeFormatBrowserTest, DecimalPointNotDot) {
   // Some locales use a comma ',' instead of a dot '.' as the separator for
   // decimal digits. The icu library wasn't handling this, leading to "1"
   // being internally converted to "+1,0e00" and ultimately leading to "NaN".
   // This showed up on the browser on estimated download time, for example.
   // http://crbug.com/60476
 
-  string16 one_min =
+  base::string16 one_min =
       ui::TimeFormat::TimeRemainingShort(TimeDelta::FromMinutes(1));
   EXPECT_EQ(ASCIIToUTF16("1 min"), one_min);
 }