Convert from using env['PLATFORM'] directly to using the more flexible...

webkit/default_plugin/SConscript

 # 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('env')
 
 env = env.Clone()
 
 env.Prepend(
     CPPPATH = [
         '$CHROME_SRC_DIR/webkit/glue',
         '$ICU38/public/common',
         '$ICU38/public/i18n',
         '$CHROME_SRC_DIR/third_party/libxml/include',
         '$CHROME_SRC_DIR/third_party/npapi',
         '$CHROME_SRC_DIR',
     ],
 )
 
 env.Append(
   CPPDEFINES = [
       'U_STATIC_IMPLEMENTATION',
       'LIBXML_STATIC',
   ],
 )
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   env.Append(
       CCFLAGS = [
           '/TP',
 
           '/WX',
           '/Wp64',
       ],
   )
 
 # Platform-independent files.
 input_files = [
 ]
 
 # TODO: Quarantine files -- need porting to platform-specific blocks above.
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   input_files.extend([
       'activex_installer.cc',
       'default_plugin.cc',
       'plugin_main.cc',
       'plugin_impl.cc',
       'plugin_database_handler.cc',
       'plugin_install_job_monitor.cc',
       'install_dialog.cc',
   ])
 
 env.ChromeStaticLibrary('default_plugin', input_files)