Convert LoadTimingObserver ui_test to be a browser_test. I'm renabling it in the process to see if …

chrome/chrome_tests.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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 743 matching lines @@
         '..',
       ],
       'sources': [
         # NOTE: DON'T ADD NEW TESTS HERE!
         # New tests should be browser_tests. browser_tests are sharded and are
         # less flakier.
         'browser/history/redirect_uitest.cc',
         'browser/iframe_uitest.cc',
         'browser/images_uitest.cc',
         'browser/locale_tests_uitest.cc',
-        'browser/net/load_timing_observer_uitest.cc',
         'browser/prefs/pref_service_uitest.cc',
         'browser/printing/printing_layout_uitest.cc',
         'browser/process_singleton_linux_uitest.cc',
         'browser/process_singleton_uitest.cc',
         'browser/repost_form_warning_uitest.cc',
         'browser/sanity_uitest.cc',
         'browser/session_history_uitest.cc',
         'browser/sessions/session_restore_uitest.cc',
         'browser/tab_contents/view_source_uitest.cc',
         'browser/tab_restore_uitest.cc',
@@ skipping 2099 matching lines @@
         'browser/geolocation/geolocation_browsertest.cc',
         'browser/history/history_browsertest.cc',
         'browser/history/history_extension_apitest.cc',
         'browser/history/multipart_browsertest.cc',
         'browser/history/top_sites_extension_test.cc',
         'browser/infobars/infobar_extension_apitest.cc',
         'browser/importer/toolbar_importer_utils_browsertest.cc',
         'browser/metrics/metrics_service_browsertest.cc',
         'browser/net/cookie_policy_browsertest.cc',
         'browser/net/ftp_browsertest.cc',
+        'browser/net/load_timing_observer_browsertest.cc',
         'browser/notifications/desktop_notifications_unittest.cc',
         'browser/notifications/desktop_notifications_unittest.h',
         'browser/oom_priority_manager_browsertest.cc',
         'browser/policy/device_management_service_browsertest.cc',
         'browser/popup_blocker_browsertest.cc',
         'browser/prerender/prefetch_browsertest.cc',
         'browser/prerender/prerender_browsertest.cc',
         'browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc',
         'browser/printing/print_preview_tab_controller_browsertest.cc',
         'browser/profiles/profile_browsertest.cc',
@@ skipping 1859 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'
 }