Remove PowerUsageMonitor.

chrome/browser/BUILD.gn

 # Copyright 2014 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("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 3310 matching lines @@
       "notifications/system_component_notifier_source_chromeos.cc",
       "notifications/system_component_notifier_source_chromeos.h",
       "notifications/web_page_notifier_source.cc",
       "notifications/web_page_notifier_source.h",
       "obsolete_system/obsolete_system.h",
       "obsolete_system/obsolete_system_linux.cc",
       "obsolete_system/obsolete_system_mac.cc",
       "obsolete_system/obsolete_system_win.cc",
       "pdf/pdf_extension_util.cc",
       "pdf/pdf_extension_util.h",
-      "power_usage_monitor/power_usage_monitor.cc",
-      "power_usage_monitor/power_usage_monitor.h",
       "process_singleton_modal_dialog_lock.cc",
       "process_singleton_modal_dialog_lock.h",
       "process_singleton_posix.cc",
       "process_singleton_startup_lock.cc",
       "process_singleton_startup_lock.h",
       "profile_resetter/brandcode_config_fetcher.cc",
       "profile_resetter/brandcode_config_fetcher.h",
       "profile_resetter/brandcoded_default_settings.cc",
       "profile_resetter/brandcoded_default_settings.h",
       "profile_resetter/profile_resetter.cc",
@@ skipping 1199 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_manifest") {
   name = "preferences"
   source = "prefs/preferences_manifest.json"
 }