Remove the unmaintained performance monitor.

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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//components/nacl/nacl_defines.gni")
 import("//tools/grit/grit_rule.gni")
 
@@ skipping 122 matching lines @@
     #        # This file is generated by
     #        # chrome/browser/metrics/variations/generate_resources_map.py
     #        '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/metrics/variations/generated_resources_map.cc',
 
     defines = nacl_defines
 
     deps += [
       "//apps",
       "//cc",
       "//chrome/browser/devtools",
-      "//chrome/browser/performance_monitor",
       "//chrome/common/extensions/api",
       "//chrome/common/extensions/api:api_registration",
       "//chrome/installer/util",
       "//components/autofill/content/browser",
       "//components/dom_distiller/content",
       "//components/keyed_service/content",
       "//components/navigation_interception",
       "//components/password_manager/content/browser",
       "//components/precache/content",
       "//components/sessions",
@@ skipping 508 matching lines @@
 # TODO(GYP) write internal action
 if (false) {  #if (is_chrome_branded) {
   action("chrome_internal_resources_gen") {
     # TODO(GYP)
   }
 } else {
   group("chrome_internal_resources_gen") {
     # Empty placeholder.
   }
 }