Remove the unmaintained performance monitor.

chrome/chrome_browser.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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 814 matching lines @@
       'browser/password_manager/password_store_mac.h',
       'browser/password_manager/password_store_mac_internal.h',
       'browser/password_manager/password_store_win.cc',
       'browser/password_manager/password_store_win.h',
       'browser/password_manager/password_store_x.cc',
       'browser/password_manager/password_store_x.h',
       'browser/password_manager/save_password_infobar_delegate.cc',
       'browser/password_manager/save_password_infobar_delegate.h',
       'browser/password_manager/sync_metrics.cc',
       'browser/password_manager/sync_metrics.h',
-      'browser/performance_monitor/constants.cc',
-      'browser/performance_monitor/constants.h',
-      'browser/performance_monitor/database.cc',
-      'browser/performance_monitor/database.h',
-      'browser/performance_monitor/event.cc',
-      'browser/performance_monitor/event.h',
-      'browser/performance_monitor/key_builder.cc',
-      'browser/performance_monitor/key_builder.h',
-      'browser/performance_monitor/metric.cc',
-      'browser/performance_monitor/metric.h',
       'browser/performance_monitor/performance_monitor.cc',
       'browser/performance_monitor/performance_monitor.h',
-      'browser/performance_monitor/performance_monitor_util.cc',
-      'browser/performance_monitor/performance_monitor_util.h',
       'browser/performance_monitor/process_metrics_history.cc',
       'browser/performance_monitor/process_metrics_history.h',
-      'browser/performance_monitor/startup_timer.cc',
-      'browser/performance_monitor/startup_timer.h',
       'browser/platform_util.h',
       'browser/platform_util_android.cc',
       'browser/platform_util_chromeos.cc',
       'browser/platform_util_mac.mm',
       'browser/platform_util_win.cc',
       'browser/power/process_power_collector.cc',
       'browser/power/process_power_collector.h',
       'browser/precache/most_visited_urls_provider.cc',
       'browser/precache/most_visited_urls_provider.h',
       'browser/predictors/autocomplete_action_predictor.cc',
@@ skipping 2014 matching lines @@
       'export_dependent_settings': [
         '../components/components.gyp:autofill_core_browser',
         '../content/content.gyp:content_browser',
         '../sql/sql.gyp:sql',
         '../sync/sync.gyp:sync',
       ],
       'conditions': [
         ['OS != "ios"', {
           'dependencies': [
             'apps',
-            'browser/performance_monitor/performance_monitor.gyp:performance_monitor',
             'browser/extensions/api/api_registration.gyp:chrome_api_registration',
             'common/extensions/api/api.gyp:chrome_api',
             'debugger',
             'installer_util',
             '../third_party/re2/re2.gyp:re2',
             '../cc/cc.gyp:cc',
             '../components/components.gyp:autofill_content_browser',
             '../components/components.gyp:dom_distiller_content',
             '../components/components.gyp:keyed_service_content',
             '../components/components.gyp:navigation_interception',
@@ skipping 664 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }