Reduce flakiness in chrome_frame_tests.exe by having each run in a clean environment.

chrome_frame/chrome_frame.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': '../tools/build/version.py',
@@ skipping 218 matching lines @@
         'test/mock_ie_event_sink_actions.h',
         'test/mock_ie_event_sink_test.cc',
         'test/mock_ie_event_sink_test.h',
         'test/navigation_test.cc',
         'test/proxy_factory_mock.cc',
         'test/proxy_factory_mock.h',
         'test/run_all_unittests.cc',
         'test/simple_resource_loader_test.cc',
         'test/simulate_input.cc',
         'test/simulate_input.h',
+        'test/test_scrubber.cc',
+        'test/test_scrubber.h',
         'test/test_server.cc',
         'test/test_server.h',
         'test/test_server_test.cc',
         'test/test_with_web_server.cc',
         'test/test_with_web_server.h',
         'test/ui_test.cc',
         'test/urlmon_moniker_tests.h',
         'test/urlmon_moniker_integration_test.cc',
         'test/url_request_test.cc',
         'test/win_event_receiver.cc',
@@ skipping 302 matching lines @@
         'test/chrome_frame_ui_test_utils.h',
         'test/external_sites_test.cc',
         'test/ie_event_sink.cc',
         'test/ie_event_sink.h',
         'test/mock_ie_event_sink_actions.h',
         'test/mock_ie_event_sink_test.cc',
         'test/mock_ie_event_sink_test.h',
         'test/run_all_unittests.cc',
         'test/simulate_input.cc',
         'test/simulate_input.h',
+        'test/test_scrubber.cc',
+        'test/test_scrubber.h',
         'test/test_server.cc',
         'test/test_server.h',
         'test/test_with_web_server.cc',
         'test/test_with_web_server.h',
         'test/win_event_receiver.cc',
         'test/win_event_receiver.h',
         '<(SHARED_INTERMEDIATE_DIR)/chrome_frame/chrome_tab.h',
         'chrome_tab.idl',
         'test_utils.cc',
         'test_utils.h',
@@ skipping 474 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],
         },
       ],
     }, ],  # 'coverage!=0'
   ],  # 'conditions'
 }