Update from https://crrev.com/320931

base/base_paths_win.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_BASE_PATHS_WIN_H__
 #define BASE_BASE_PATHS_WIN_H__
 
 // This file declares windows-specific path keys for the base module.
 // These can be used with the PathService to access various special
 // directories and files.
 
 namespace base {
 
 enum {
   PATH_WIN_START = 100,
 
   DIR_WINDOWS,  // Windows directory, usually "c:\windows"
   DIR_SYSTEM,   // Usually c:\windows\system32"
-  DIR_PROGRAM_FILES,      // Usually c:\program files
-  DIR_PROGRAM_FILESX86,   // Usually c:\program files or c:\program files (x86)
+  //                         32-bit     32-bit on 64-bit   64-bit on 64-bit
+  // DIR_PROGRAM_FILES         1               2                  1
+  // DIR_PROGRAM_FILESX86      1               2                  2
+  // DIR_PROGRAM_FILES6432     1               1                  1
+  // 1 - C:\Program Files   2 - C:\Program Files (x86)
+  DIR_PROGRAM_FILES,      // See table above.
+  DIR_PROGRAM_FILESX86,   // See table above.
+  DIR_PROGRAM_FILES6432,  // See table above.
 
   DIR_IE_INTERNET_CACHE,  // Temporary Internet Files directory.
   DIR_COMMON_START_MENU,  // Usually "C:\Documents and Settings\All Users\
                           // Start Menu\Programs"
   DIR_START_MENU,         // Usually "C:\Documents and Settings\<user>\
                           // Start Menu\Programs"
   DIR_APP_DATA,           // Application Data directory under the user profile.
   DIR_LOCAL_APP_DATA,     // "Local Settings\Application Data" directory under
                           // the user profile.
   DIR_COMMON_APP_DATA,    // W2K, XP, W2K3: "C:\Documents and Settings\
                           // All Users\Application Data".
                           // Vista, W2K8 and above: "C:\ProgramData".
   DIR_APP_SHORTCUTS,      // Where tiles on the start screen are stored, only
                           // for Windows 8. Maps to "Local\AppData\Microsoft\
                           // Windows\Application Shortcuts\".
   DIR_COMMON_DESKTOP,     // Directory for the common desktop (visible
                           // on all user's Desktop).
   DIR_USER_QUICK_LAUNCH,  // Directory for the quick launch shortcuts.
   DIR_TASKBAR_PINS,       // Directory for the shortcuts pinned to taskbar via
                           // base::win::TaskbarPinShortcutLink().
   DIR_WINDOWS_FONTS,      // Usually C:\Windows\Fonts.
 
   PATH_WIN_END
 };
 
 }  // namespace base
 
 #endif  // BASE_BASE_PATHS_WIN_H__