Replace string16 with base::string16.

chrome/browser/chromeos/drive/file_system_util_unittest.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/chromeos/drive/file_system_util.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 21 matching lines @@
   // Path with symbols.
   path = GetDriveMyDriveRootPath().AppendASCII(
       " !\"#$%&'()*+,-.:;<=>?@[\\]^_`{|}~");
   EXPECT_EQ(path, DriveURLToFilePath(FilePathToDriveURL(path)));
 
   // Path with '%'.
   path = GetDriveMyDriveRootPath().AppendASCII("%19%20%21.txt");
   EXPECT_EQ(path, DriveURLToFilePath(FilePathToDriveURL(path)));
 
   // Path with multi byte characters.
-  string16 utf16_string;
+  base::string16 utf16_string;
   utf16_string.push_back(0x307b);  // HIRAGANA_LETTER_HO
   utf16_string.push_back(0x3052);  // HIRAGANA_LETTER_GE
   path = GetDriveMyDriveRootPath().Append(
       base::FilePath::FromUTF8Unsafe(UTF16ToUTF8(utf16_string) + ".txt"));
   EXPECT_EQ(path, DriveURLToFilePath(FilePathToDriveURL(path)));
 }
 
 TEST(FileSystemUtilTest, IsUnderDriveMountPoint) {
   EXPECT_FALSE(IsUnderDriveMountPoint(
       base::FilePath::FromUTF8Unsafe("/wherever/foo.txt")));
@@ skipping 242 matching lines @@
   file = temp_dir.path().AppendASCII("test.txt");
   std::string data = "Hello world!";
   EXPECT_TRUE(google_apis::test_util::WriteStringToFile(file, data));
   EXPECT_FALSE(HasGDocFileExtension(file));
   EXPECT_TRUE(ReadUrlFromGDocFile(file).is_empty());
   EXPECT_TRUE(ReadResourceIdFromGDocFile(file).empty());
 }
 
 }  // namespace util
 }  // namespace drive