Add field to monitor last visited time for each search engine

chrome/browser/extensions/api/settings_overrides/settings_overrides_api.cc

Index: chrome/browser/extensions/api/settings_overrides/settings_overrides_api.cc
diff --git a/chrome/browser/extensions/api/settings_overrides/settings_overrides_api.cc b/chrome/browser/extensions/api/settings_overrides/settings_overrides_api.cc
index 7b8882b66c5128b0de506fbf8604476bb78bd76d..18bc178e4934d86427106a18ce52ad4b97091649 100644
--- a/chrome/browser/extensions/api/settings_overrides/settings_overrides_api.cc
+++ b/chrome/browser/extensions/api/settings_overrides/settings_overrides_api.cc
@@ -112,6 +112,7 @@ std::unique_ptr<TemplateURLData> ConvertSearchProvider(
   }
   data->date_created = base::Time();
   data->last_modified = base::Time();
+  data->last_visited = base::Time();

[Peter Kasting, 2016/11/21 03:35:07]

I don't really understand why |date_created| and |last_modified| were set to
Time() here, but you don't really need to fix those in this CL as that's
unrelated.

I think setting |last_visited| to Time() is correct, but should be done in the
constructor instead of here.  See comments there.

[ltian, 2016/11/28 22:08:01]

Done.

   data->prepopulate_id = 0;
   if (search_provider.alternate_urls) {
     data->alternate_urls.clear();