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

sandbox/tests/integration_tests/sbox_integration_tests.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.
 
 Import('env')
 
 env = env.Clone()
 
 env.ApplySConscript([
     '$BASE_DIR/using_base.scons',
     '$GTEST_DIR/../using_gtest.scons',
     '$SANDBOX_DIR/using_sandbox.scons',
 ])
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   env.Append(
       CCFLAGS = [
           '/WX',          # treat warnings as errors
       ],
   )
 
 # TODO(bradnelson): This step generates integration_tests.pch.ib_tag
 #                   SCons doesn't know.
 env_p = env.Clone()
 pch, obj = env_p.PCH(['integration_tests.pch', 'integration_tests.obj'],
@@ skipping 16 matching lines @@
     '$SANDBOX_DIR/src/process_policy_test.cc',
     '$SANDBOX_DIR/src/registry_policy_test.cc',
     '$SANDBOX_DIR/src/sync_policy_test.cc',
     '$SANDBOX_DIR/src/unload_dll_test.cc',
 
     '../common/controller$OBJSUFFIX',
 ]
 
 env.ChromeTestProgram('sbox_integration_tests', input_files,
                       COMPONENT_PLATFORM_SETUP=None)