Revert sdk 6.1 upgrade changes.

build/SConscript.main

 # Copyright (c) 2006-2008 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.
 
 import os
 import shutil
 import sys
 
 
 if sys.platform == 'win32':
@@ skipping 251 matching lines @@
   msvs_drive = msvs_env['PATH'][0]
 else:
   msvs_env = {'PATH': '', 'INCLUDE': '', 'LIB': ''}
   msvs_drive = 'C'
 
 # Use the absolute path for MSVC because it might not be on the same drive
 # as our source checkout.
 visual_studio_path = msvs_drive + ':/Program Files/Microsoft Visual Studio 8'
 
 # If side-by-side platform sdk is not available try local copy.
-platform_sdk_path = '$CHROME_SRC_DIR/third_party/platformsdk_win2008_6_1/files'
+platform_sdk_path = '$CHROME_SRC_DIR/third_party/platformsdk_vista_6_0/files'
 if (root_env['PLATFORM'] in ['win32', 'cygwin'] and
     not os.path.exists(windows_env.subst(platform_sdk_path))):
   platform_sdk_path = (
-      msvs_drive + ':\\Program Files\\Microsoft SDKs\\Windows\\v6.1')
+      msvs_drive + ':\\Program Files\\Microsoft SDKs\\Windows\\v6.0')
 
 windows_env.Replace(
     CSCRIPT = 'c:\\Windows\\System32\\cscript',
 
-    PLATFORMSDK_6_1 = platform_sdk_path,
+    PLATFORMSDK_VISTA = platform_sdk_path,
     VISUAL_STUDIO = visual_studio_path,
 
     CYGWIN_DIR = windows_env.Dir('$CHROME_SRC_DIR/third_party/cygwin'),
     CYGWIN_BIN_DIR = '$CYGWIN_DIR/bin',
 
     PERL = '$CYGWIN_BIN_DIR/perl.exe',
 
     MSVS_ENV = msvs_env,
 
     YACC = '$CYGWIN_BIN_DIR/bison.exe',
@@ skipping 514 matching lines @@
         'all_libraries',
         'all_languages',
         'all_programs',
         'all_test_programs',
     ], projects = [p],
     COMPONENT_VS_PROJECT_SCRIPT_PATH=(
         'cd $$(ProjectDir)/$VS_PROJECT_TO_MAIN_DIR && hammer.bat'),
 )
 
 # -------------------------------------------------------------------------