Add integration browser tests for settings hardening.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 13d89d3180eb38f351e3193f167caddebed4f752..1da36af8d9751813c6004d5a4b3a22dbe70c8974 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -298,7 +298,7 @@
           ],
           'sources!': [
             '../ui/views/widget/desktop_aura/desktop_window_tree_host_x11_interactive_uitest.cc',
-            '../ui/views/widget/desktop_aura/x11_topmost_window_finder_interactive_uitest.cc', 
+            '../ui/views/widget/desktop_aura/x11_topmost_window_finder_interactive_uitest.cc',
 
             # chromeos does not use cross-platform panels
             'browser/notifications/notification_browsertest.cc',
@@ -1315,6 +1315,7 @@
         'browser/prefs/pref_functional_browsertest.cc',
         'browser/prefs/pref_service_browsertest.cc',
         'browser/prefs/synced_pref_change_registrar_browsertest.cc',
+        'browser/prefs/tracked/pref_hash_browsertest.cc',
         'browser/prerender/prerender_browsertest.cc',
         'browser/printing/cloud_print/test/cloud_print_policy_browsertest.cc',
         'browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc',