Remove wstring file path helpers from test_file_util.

base/test/test_file_util.h

 // 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.
 
 #ifndef BASE_TEST_TEST_FILE_UTIL_H_
 #define BASE_TEST_TEST_FILE_UTIL_H_
 
 // File utility functions used only by tests.
 
 #include <string>
@@ skipping 34 matching lines @@
 // the one that set the zone identifier.  I.e. don't use it in UI/automation
 // based tests.
 bool HasInternetZoneIdentifier(const FilePath& full_path);
 #endif  // defined(OS_WIN)
 
 }  // namespace base
 
 // TODO(brettw) move all of this to the base namespace.
 namespace file_util {
 
-// In general it's not reliable to convert a FilePath to a wstring and we use
-// string16 elsewhere for Unicode strings, but in tests it is frequently
-// convenient to be able to compare paths to literals like L"foobar".
-std::wstring FilePathAsWString(const base::FilePath& path);
-base::FilePath WStringAsFilePath(const std::wstring& path);
-
 // For testing, make the file unreadable or unwritable.
 // In POSIX, this does not apply to the root user.
 bool MakeFileUnreadable(const base::FilePath& path) WARN_UNUSED_RESULT;
 bool MakeFileUnwritable(const base::FilePath& path) WARN_UNUSED_RESULT;
 
 #if defined(OS_ANDROID)
 // Register the ContentUriTestUrils JNI bindings.
 bool RegisterContentUriTestUtils(JNIEnv* env);
 
 // Insert an image file into the MediaStore, and retrieve the content URI for
@@ skipping 11 matching lines @@
   const base::FilePath path_;
   void* info_;  // The opaque stored permission information.
   size_t length_;  // The length of the stored permission information.
 
   DISALLOW_COPY_AND_ASSIGN(PermissionRestorer);
 };
 
 }  // namespace file_util
 
 #endif  // BASE_TEST_TEST_FILE_UTIL_H_