Extend PathService::Get to be able to return the X86 program files path.

base/base_paths_win.h

Index: base/base_paths_win.h
diff --git a/base/base_paths_win.h b/base/base_paths_win.h
index 9e2db36d7e7cf1cba22cc08eade8f96e1460108d..02b1f49ba7e158abd079c890b90320ba5180843c 100644
--- a/base/base_paths_win.h
+++ b/base/base_paths_win.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -17,7 +17,8 @@ enum {
 
   DIR_WINDOWS,  // Windows directory, usually "c:\windows"
   DIR_SYSTEM,   // Usually c:\windows\system32"
-  DIR_PROGRAM_FILES, // Usually c:\program files
+  DIR_PROGRAM_FILES,      // Usually c:\program files
+  DIR_PROGRAM_FILESX86,   // Usually c:\program files or c:\program files (x86)
 
   DIR_IE_INTERNET_CACHE,  // Temporary Internet Files directory.
   DIR_COMMON_START_MENU,  // Usually "C:\Documents and Settings\All Users\