chromeos: Remove UpdateLibrary code, which is no longer used.

chrome/chrome_tests.gypi

 # Copyright (c) 2011 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.
 {
   'target_defaults': {
     'conditions': [
       ['strip_tests==1', {
         'cflags!': [ '-g' ],
         'ldflags': [ '-Wl,--strip-debug' ],
       }],
@@ skipping 2462 matching lines @@
         'browser/browsing_data_local_storage_helper_browsertest.cc',
         'browser/chromeos/brightness_bubble_browsertest.cc',
         'browser/chromeos/cros/cros_in_process_browser_test.cc',
         'browser/chromeos/cros/cros_in_process_browser_test.h',
         'browser/chromeos/cros/cros_mock.cc',
         'browser/chromeos/cros/cros_mock.h',
         'browser/chromeos/cros/mock_power_library.cc',
         'browser/chromeos/cros/mock_power_library.h',
         'browser/chromeos/cros/mock_screen_lock_library.cc',
         'browser/chromeos/cros/mock_screen_lock_library.h',
-        'browser/chromeos/cros/mock_update_library.cc',
-        'browser/chromeos/cros/mock_update_library.h',
         'browser/chromeos/disks/mock_disk_mount_manager.cc',
         'browser/chromeos/disks/mock_disk_mount_manager.h',
         'browser/chromeos/extensions/file_browser_notifications_browsertest.cc',
         'browser/chromeos/login/enrollment/enterprise_enrollment_screen_browsertest.cc',
         'browser/chromeos/login/existing_user_controller_browsertest.cc',
         'browser/chromeos/login/login_browsertest.cc',
         'browser/chromeos/login/login_utils_browsertest.cc',
         'browser/chromeos/login/mock_authenticator.cc',
         'browser/chromeos/login/mock_authenticator.h',
         'browser/chromeos/login/enrollment/mock_enterprise_enrollment_screen.cc',
@@ skipping 1847 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }