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

chrome/test/perf/perftests.scons

 # Copyright (c) 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 perf_tests{,.exe} executable.
 """
 
 Import('env')
 
@@ skipping 12 matching lines @@
     CPPDEFINES = [
         'PERF_TEST',
     ],
     LIBS = [
         'browser',
         'common',
         'sqlite',
     ],
 )
 
-if env['PLATFORM'] in ('posix', 'darwin'):
+if env.Bit('posix'):
   env.SConscript([
       '$LIBEVENT_DIR/using_libevent.scons',
   ], {'env':env})
 
 input_files = [
     'perftests.cc',
     'url_parse_perftest.cc',
     '$BASE_DIR/perftimer$OBJSUFFIX',
     '$CHROME_DIR/browser/safe_browsing/database_perftest.cc',
     '$CHROME_DIR/browser/visitedlink_master$OBJSUFFIX',
     '$CHROME_DIR/browser/visitedlink_perftest.cc',
     '$CHROME_DIR/common/json_value_serializer_perftest.cc',
 ]
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   env.Prepend(
       LIBS = [
           'rpcrt4',
           'shlwapi',
           'winmm',
       ]
   )
 
-if env['PLATFORM'] != 'win32':
+if env.Bit('linux'):
   # TODO(port): Port these files.
   remove_files = [
       'url_parse_perftest.cc',
       '$CHROME_DIR/browser/visitedlink_master$OBJSUFFIX',
       '$CHROME_DIR/browser/visitedlink_perftest.cc',
   ]
   for file in remove_files:
     input_files.remove(file)
 
-if env['PLATFORM'] in ('posix', 'win32'):
+if env.Bit('mac'):
+  # TODO(port): Port these files.
+  remove_files = [
+      'url_parse_perftest.cc',
+      '$CHROME_DIR/browser/visitedlink_master$OBJSUFFIX',
+      '$CHROME_DIR/browser/visitedlink_perftest.cc',
+  ]
+  for file in remove_files:
+    input_files.remove(file)
+
+if not env.Bit('mac'):
   env.ChromeTestProgram('perf_tests', input_files)