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

breakpad/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 = [
         'src',
         '$CHROME_SRC_DIR',
     ],
 )
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   env.Append(
       CCFLAGS = [
           '/TP',
           '/wd4800',
       ],
   )
 
   sender_input_files = [
       'src/client/windows/sender/crash_report_sender.cc',
       'src/common/windows/http_upload.cc',
   ]
 
   env.ChromeStaticLibrary('breakpad_sender', sender_input_files)
 
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   handler_input_files = [
       'src/client/windows/crash_generation/client_info.cc',
       'src/client/windows/crash_generation/minidump_generator.cc',
       'src/common/windows/guid_string.cc',
       'src/client/windows/handler/exception_handler.cc',
       'src/client/windows/crash_generation/crash_generation_server.cc',
       'src/client/windows/crash_generation/crash_generation_client.cc',
   ]
-elif env['PLATFORM'] == 'posix':
+elif env.Bit('linux'):
   handler_input_files = [
       'src/common/linux/guid_creator.cc',
       'src/client/linux/handler/exception_handler.cc',
       'src/client/linux/handler/minidump_generator.cc',
       'src/client/linux/handler/linux_thread.cc',
   ]
 
 env.ChromeStaticLibrary('breakpad_handler', handler_input_files)