Add back DefaultSearchProviderType UMA metric.

chrome/browser/search_engines/template_url_service.cc

Index: chrome/browser/search_engines/template_url_service.cc
diff --git a/chrome/browser/search_engines/template_url_service.cc b/chrome/browser/search_engines/template_url_service.cc
index bc44c0207813b8c465ddf306f65d08640da25647..1f4a64827f8d058e6948fc51c97c8575582c0a76 100644
--- a/chrome/browser/search_engines/template_url_service.cc
+++ b/chrome/browser/search_engines/template_url_service.cc
@@ -959,6 +959,12 @@ void TemplateURLService::OnWebDataServiceRequestDone(
 
   if (new_resource_keyword_version)
     service_->SetBuiltinKeywordVersion(new_resource_keyword_version);
+
+  if (default_search_provider_) {
+    UMA_HISTOGRAM_ENUMERATION("Search.DefaultSearchProviderType",
+        TemplateURLPrepopulateData::GetEngineType(*default_search_provider_),
+        SEARCH_ENGINE_MAX);
+  }
 }
 
 base::string16 TemplateURLService::GetKeywordShortName(