Move more uses of string16 to specify base::

base/i18n/case_conversion_unittest.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.
 
 #include "base/i18n/case_conversion.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace base {
 namespace {
 
 // Test upper and lower case string conversion.
 TEST(CaseConversionTest, UpperLower) {
   string16 mixed(ASCIIToUTF16("Text with UPPer & lowER casE."));
   const string16 expected_lower(ASCIIToUTF16("text with upper & lower case."));
   const string16 expected_upper(ASCIIToUTF16("TEXT WITH UPPER & LOWER CASE."));
 
   string16 result = base::i18n::ToLower(mixed);
   EXPECT_EQ(expected_lower, result);
 
   result = base::i18n::ToUpper(mixed);
   EXPECT_EQ(expected_upper, result);
 }
 
 // TODO(jshin): More tests are needed, especially with non-ASCII characters.
 
 }  // namespace
+}  // namespace base