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

chrome/browser/browser.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.SConscript([
     '$CHROME_DIR/third_party/hunspell/using_hunspell.scons',
@@ skipping 12 matching lines @@
     CPPPATH = [
         '$TARGET_ROOT/grit_derived_sources',
         '$CHROME_DIR/app',
         '$CHROME_SRC_DIR',
         # To get the #include of history_indexer.h,
         # generated from history/history_indexer.idl.
         'history',
     ],
 )
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   env.Prepend(
       CPPPATH = [
           '$CHROME_DIR/tools/build/win',
       ],
   )
 
 input_files = []
 
-if env['PLATFORM'] in ('posix', 'win32'):
+if not env.Bit('mac'):
   # TODO: Port to Mac.
   input_files.extend([
       'autocomplete/keyword_provider.cc',
       'automation/url_request_failed_dns_job.cc',
       'automation/url_request_mock_http_job.cc',
       'automation/url_request_mock_net_error_job.cc',
       'automation/url_request_slow_download_job.cc',
       'bookmarks/bookmark_codec.cc',
       'bookmarks/bookmark_html_writer.cc',
       'browser_process.cc',
@@ skipping 57 matching lines @@
       'ssl_error_info.cc',
       'template_url.cc',
       'template_url_model.cc',
       'template_url_parser.cc',
       'url_fetcher.cc',
       'url_fetcher_protect.cc',
       'user_metrics.cc',
       'webdata/web_database.cc',
   ])
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   # TODO: Port these.
   input_files.extend([
       'autofill_manager.cc',
       'about_internets_status_view.cc',
       'alternate_nav_url_fetcher.cc',
       'app_modal_dialog_queue.cc',
       'autocomplete/autocomplete.cc',
       'autocomplete/autocomplete_accessibility.cc',
       'autocomplete/autocomplete_edit.cc',
       'autocomplete/autocomplete_popup.cc',
@@ skipping 162 matching lines @@
   ])
 
   env.TypeLibrary('history/history_indexer.idl')
 
   input_files.extend([
       'importer/firefox_profile_lock_win.cc',
       'render_widget_host_view_win.cc',
       'web_contents_view_win.cc',
   ])
 
-if env['PLATFORM'] in ('darwin', 'posix'):
+if env.Bit('posix'):
   input_files.extend([
       'importer/firefox_profile_lock_posix.cc',
   ])
 
-if env['PLATFORM'] in ('posix', 'win32'):
+if not env.Bit('mac'):
   # TODO: This should work for all platforms.
   env.ChromeStaticLibrary('browser', input_files)