Cleanup: Remove deprecated version of file_util::AppendToPath().

base/file_util_deprecated.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.
 
 // We're trying to transition away from paths as wstrings into using
 // FilePath objects.  This file contains declarations of deprecated
 // functions.  By hiding them here rather in the main header, we hope
 // to discourage callers.
 
 // See file_util.h for documentation on all functions that don't have
@@ skipping 12 matching lines @@
 #if !defined(OS_WIN)
 #error Do not include on non-Windows platforms.
 #endif
 
 namespace file_util {
 
 // Use the FilePath versions instead.
 BASE_EXPORT FILE* OpenFile(const std::string& filename, const char* mode);
 BASE_EXPORT FILE* OpenFile(const std::wstring& filename, const char* mode);
 
-// Appends new_ending to path, adding a separator between the two if necessary.
-BASE_EXPORT void AppendToPath(std::wstring* path,
-                              const std::wstring& new_ending);
-
 // Use version that takes a FilePath.
 BASE_EXPORT int ReadFile(const std::wstring& filename, char* data, int size);
 BASE_EXPORT int WriteFile(const std::wstring& filename,
                           const char* data, int size);
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_DEPRECATED_H_