Fix the windows search path to look in oldest applicable platform dir first...

webkit/tools/layout_tests/layout_package/platform_utils_win.py

 # Copyright (c) 2006-2009 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.
 
 """This is the Linux implementation of the layout_package.platform_utils
    package. This file should only be imported by that package."""
 
 import path_utils
 import subprocess
 import sys
@@ skipping 25 matching lines @@
   for all versions instead of the current version that the script
   is running on. This is for case that the platform or version of
   the search paths is different from the platform or version that the
   script is running on. For example, the rebaseline tool may run on Mac,
   Linux or Windows Vista to rebaseline for Windows XP, in which case,
   it gets a full list, finds the rebaselining dir (XP) and compares
   the XP baseline with fallback baselines.
   """
 
   dirs = []
+  if all_versions or PlatformVersion() == "-xp":
+    dirs.append(path_utils.ChromiumBaselinePath('chromium-win-xp'))
+  if all_versions or PlatformVersion() in ("-vista", "-xp"):
+    dirs.append(path_utils.ChromiumBaselinePath('chromium-win-vista'))
   if all_versions or PlatformVersion() in ("-7", "-vista", "-xp"):
     dirs.append(path_utils.ChromiumBaselinePath('chromium-win-7'))
-  if all_versions or PlatformVersion() in ("-vista", "-xp"):
-    dirs.append(path_utils.ChromiumBaselinePath('chromium-win-vista'))
-  if all_versions or PlatformVersion() == "-xp":
-    dirs.append(path_utils.ChromiumBaselinePath('chromium-win-xp'))
   dirs.append(path_utils.ChromiumBaselinePath('chromium-win'))
   dirs.append(path_utils.WebKitBaselinePath('win'))
   dirs.append(path_utils.WebKitBaselinePath('mac'))
   return dirs
 
 def WDiffPath():
   """Path to the WDiff executable, whose binary is checked in on Win"""
   return path_utils.PathFromBase('third_party', 'cygwin', 'bin', 'wdiff.exe')
 
 def ImageDiffPath(target):
@@ skipping 76 matching lines @@
   two places: src/webkit/$target (preferably, which we get if we
   built using webkit.gyp), or src/chrome/$target (if compiled some other
   way)."""
   try:
     return path_utils.PathFromBase('webkit', target, binary)
   except path_utils.PathNotFound:
     try:
       return path_utils.PathFromBase('chrome', target, binary)
     except path_utils.PathNotFound:
       return path_utils.PathFromBase('build', target, binary)