Implement IsSearchProviderInstalled and a test for it.

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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_dll_resource.h',
       'common/pref_names.cc',
       'common/pref_names.h',
@@ skipping 297 matching lines @@
         'browser/renderer_host/resource_dispatcher_host_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',
         'browser/unload_uitest.cc',
         'browser/views/find_bar_host_uitest.cc',
         'common/logging_chrome_uitest.cc',
+        'renderer/external_extension_uitest.cc',
         'test/automation/automation_proxy_uitest.cc',
         'test/automation/extension_proxy_uitest.cc',
         'test/automated_ui_tests/automated_ui_test_test.cc',
         'test/chrome_process_util_uitest.cc',
         'test/ui/dom_checker_uitest.cc',
         'test/ui/dromaeo_benchmark_uitest.cc',
         'test/ui/fast_shutdown_uitest.cc',
         'test/ui/history_uitest.cc',
         'test/ui/layout_plugin_uitest.cc',
         'test/ui/npapi_uitest.cc',
@@ skipping 2245 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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