Convert the external extension ui_test to a browser_test.

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 759 matching lines @@
         'browser/sessions/session_restore_uitest.cc',
         'browser/ui/tests/browser_uitest.cc',
         'browser/ui/views/find_bar_host_uitest.cc',
         'browser/ui/webui/bookmarks_ui_uitest.cc',
         'browser/ui/webui/ntp/new_tab_ui_uitest.cc',
         'browser/ui/webui/options2/chromeos/guest_mode_options_ui2_uitest.cc',
         'browser/ui/webui/options2/options_ui2_uitest.cc',
         'browser/ui/webui/options2/options_ui2_uitest.h',
         'browser/ui/webui/print_preview/print_preview_ui_uitest.cc',
         'common/logging_chrome_uitest.cc',
-        'renderer/external_extension_uitest.cc',
         'renderer/loadtimes_extension_bindings_uitest.cc',
         'test/automation/automation_proxy_uitest.cc',
         'test/automation/automation_proxy_uitest.h',
         'test/automation/extension_proxy_uitest.cc',
         'test/base/chrome_process_util_uitest.cc',
         'test/reliability/automated_ui_test_test.cc',
         'test/ui/history_uitest.cc',
         'test/ui/layout_plugin_uitest.cc',
         'test/ui/named_interface_uitest.cc',
         'test/ui/npapi_uitest.cc',
@@ skipping 2073 matching lines @@
         'browser/extensions/lazy_background_page_apitest.cc',
         'browser/extensions/mutation_observers_apitest.cc',
         'browser/extensions/notifications_apitest.cc',
         'browser/extensions/platform_app_browsertest.cc',
         'browser/extensions/process_management_browsertest.cc',
         'browser/extensions/settings/settings_apitest.cc',
         'browser/extensions/stubs_apitest.cc',
         'browser/extensions/system/system_apitest.cc',
         'browser/extensions/webstore_inline_install_browsertest.cc',
         'browser/extensions/window_open_apitest.cc',
+        'browser/external_extension_browsertest.cc',
         'browser/fast_shutdown_browsertest.cc',
         'browser/first_run/first_run_browsertest.cc',
         'browser/first_run/try_chrome_dialog_view_browsertest.cc',
         'browser/geolocation/access_token_store_browsertest.cc',
         'browser/geolocation/geolocation_browsertest.cc',
         'browser/history/history_browsertest.cc',
         'browser/history/history_extension_apitest.cc',
         'browser/history/multipart_browsertest.cc',
         'browser/history/redirect_browsertest.cc',
         'browser/history/top_sites_extension_test.cc',
@@ skipping 1816 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'
 }