Remove the unmaintained performance monitor.

chrome/chrome_browser_chromeos.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_chromeos',
       'type': 'static_library',
       'variables': {
         'conditions': [
           ['sysroot!=""', {
             'pkg-config': '../build/linux/pkg-config-wrapper "<(sysroot)" "<(target_arch)" "<(system_libdir)"',
           }, {
             'pkg-config': 'pkg-config'
           }],
         ],
         # Override to dynamically link the cras (ChromeOS audio) library.
         'use_cras%': 0,
         'enable_wexit_time_destructors': 1,
       },
       'dependencies': [
         # TODO(tbarzic): Cleanup this list.
         'attestation_proto',
         'browser/extensions/api/api_registration.gyp:chrome_api_registration',
-        'browser/performance_monitor/performance_monitor.gyp:performance_monitor',
         'browser_extensions',
         'cert_logger_proto',
         'chrome_resources.gyp:chrome_extra_resources',
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:platform_locale_settings',
         'chrome_resources.gyp:theme_resources',
         'common',
         'common/extensions/api/api.gyp:chrome_api',
         'common_net',
         'debugger',
@@ skipping 1164 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }