[HaTS] Update the demo survey

The original demo survey is out of its capacity, so we change to this
survey which still have capacity to collect more responses.

Change-Id: I97d0ed351c6fba880804143869afe45142adc20e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062944
Commit-Queue: Wei Li <weili@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743296}

chrome/browser/ui/hats/hats_service.cc

@@ -47,7 +47,7 @@ constexpr char kHatsSurveyEnSiteID[] = "en_site_id";
 
 constexpr double kHatsSurveyProbabilityDefault = 0;
 
-constexpr char kHatsSurveyEnSiteIDDefault[] = "ty52vxwjrabfvhusawtrmkmx6m";
+constexpr char kHatsSurveyEnSiteIDDefault[] = "bhej2dndhpc33okm6xexsbyv4y";
 
 constexpr base::TimeDelta kMinimumTimeBetweenSurveyStarts =
     base::TimeDelta::FromDays(60);