Add base:: to string16s in chrome/.

chrome/installer/util/duplicate_tree_detector_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 <windows.h>
 
 #include <fstream>
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "chrome/installer/util/duplicate_tree_detector.h"
 #include "chrome/installer/util/installer_util_test_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class DuplicateTreeDetectorTest : public testing::Test {
  protected:
   virtual void SetUp() {
     ASSERT_TRUE(temp_source_dir_.CreateUniqueTempDir());
     ASSERT_TRUE(temp_dest_dir_.CreateUniqueTempDir());
   }
 
   // Simple function to dump some text into a new file.
   void CreateTextFile(const std::string& filename,
-                      const string16& contents) {
+                      const base::string16& contents) {
     std::wofstream file;
     file.open(filename.c_str());
     ASSERT_TRUE(file.is_open());
     file << contents;
     file.close();
   }
 
   // Creates a two level deep source dir with a file in each in |first_root| and
   // copy it (files properties will be identical) in |second_root|.
   void CreateTwoIdenticalHierarchies(const base::FilePath& first_root,
@@ skipping 108 matching lines @@
   ASSERT_TRUE(installer::test::CopyFileHierarchy(source_file, dest_file));
 
   // This file should be different.
   base::FilePath other_file(temp_dest_dir_.path());
   other_file = other_file.AppendASCII("F2");
   CreateTextFile(other_file.MaybeAsASCII(), text_content_2_);
 
   EXPECT_TRUE(installer::IsIdenticalFileHierarchy(source_file, dest_file));
   EXPECT_FALSE(installer::IsIdenticalFileHierarchy(source_file, other_file));
 }