Remove the unmaintained performance monitor.

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1085 matching lines @@
         'browser/notifications/notification_conversion_helper_unittest.cc',
         'browser/omaha_query_params/chrome_omaha_query_params_delegate_unittest.cc',
         'browser/password_manager/chrome_password_manager_client_unittest.cc',
         'browser/password_manager/native_backend_gnome_x_unittest.cc',
         'browser/password_manager/native_backend_kwallet_x_unittest.cc',
         'browser/password_manager/password_manager_internals_service_unittest.cc',
         'browser/password_manager/password_manager_metrics_util_unittest.cc',
         'browser/password_manager/password_store_mac_unittest.cc',
         'browser/password_manager/password_store_win_unittest.cc',
         'browser/password_manager/password_store_x_unittest.cc',
-        'browser/performance_monitor/database_unittest.cc',
         'browser/plugins/plugin_finder_unittest.cc',
         'browser/plugins/plugin_info_message_filter_unittest.cc',
         'browser/plugins/plugin_installer_unittest.cc',
         'browser/plugins/plugin_metadata_unittest.cc',
         'browser/plugins/plugin_prefs_unittest.cc',
         'browser/policy/cloud/cloud_policy_invalidator_unittest.cc',
         'browser/policy/cloud/user_policy_signin_service_unittest.cc',
         'browser/policy/file_selection_dialogs_policy_handler_unittest.cc',
         'browser/policy/javascript_policy_handler_unittest.cc',
         'browser/policy/managed_bookmarks_policy_handler_unittest.cc',
@@ skipping 639 matching lines @@
         'browser/ui/webui/chromeos/login/l10n_util_unittest.cc',
         'browser/ui/webui/chromeos/login/signin_userlist_unittest.cc',
         'browser/ui/webui/fileicon_source_unittest.cc',
         'browser/ui/webui/history_ui_unittest.cc',
         'browser/ui/webui/ntp/ntp_user_data_logger_unittest.cc',
         'browser/ui/webui/ntp/suggestions_combiner_unittest.cc',
         'browser/ui/webui/options/autofill_options_handler_unittest.cc',
         'browser/ui/webui/options/chromeos/cros_language_options_handler_unittest.cc',
         'browser/ui/webui/options/language_options_handler_unittest.cc',
         'browser/ui/webui/options/pepper_flash_content_settings_utils_unittest.cc',
-        'browser/ui/webui/performance_monitor/performance_monitor_ui_util_unittest.cc',
         'browser/ui/webui/print_preview/print_preview_ui_unittest.cc',
         'browser/ui/webui/signin/login_ui_service_unittest.cc',
         'browser/ui/webui/sync_setup_handler_unittest.cc',
         'browser/ui/webui/theme_source_unittest.cc',
         'browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc',
         'browser/ui/window_sizer/window_sizer_ash_unittest.cc',
         'browser/ui/window_sizer/window_sizer_common_unittest.cc',
         'browser/ui/window_sizer/window_sizer_unittest.cc',
         'browser/ui/zoom/zoom_controller_unittest.cc',
         'browser/undo/bookmark_undo_service_test.cc',
@@ skipping 1103 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }