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

media/media_unittests.scons

 # 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.
 
 __doc__ = """
 Configuration for building the media_unittests{,.exe} executable.
 """
 
 Import('env')
 
 env = env.Clone()
 
 env.SConscript([
     '$BASE_DIR/using_base.scons',
     '$GTEST_DIR/../using_gtest.scons',
     '$ICU38_DIR/using_icu38.scons',
     '$MEDIA_DIR/using_media.scons',
 ], {'env':env})
 
 env.Prepend(
     CPPPATH = [
         '$CHROME_SRC_DIR',
     ],
 )
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   env.Prepend(
       CCFLAGS = [
           '/TP',
           '/WX',
       ],
       CPPDEFINES = [
           '_WIN32_WINNT=0x0600',
           'WINVER=0x0600',
           '_HAS_EXCEPTIONS=0',
       ],
       LINKFLAGS = [
           '/DELAYLOAD:"dwmapi.dll"',
           '/DELAYLOAD:"uxtheme.dll"',
           '/MACHINE:X86',
           '/FIXED:No',
           '/safeseh',
           '/dynamicbase',
           '/ignore:4199',
           '/nxcompat',
       ],
   )
 
 input_files = [
     'base/data_buffer_unittest.cc',
     'base/run_all_unittests.cc',
 ]
 
 env.ChromeTestProgram('media_unittests', input_files)