| Index: tools/metrics/histograms/histograms.xml | 
| diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml | 
| index 7d914716a52cb3fd5e36b71f56244e68c646ff82..79fb6b0a126ba18b8dc8600b4636098aa44793ee 100644 | 
| --- a/tools/metrics/histograms/histograms.xml | 
| +++ b/tools/metrics/histograms/histograms.xml | 
| @@ -52210,6 +52210,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries. | 
| </histogram> | 
|  | 
| <histogram name="Sync.RefreshTokenAvailable" enum="BooleanSuccess"> | 
| +  <obsolete> | 
| +    Deprecated 04/2016 as not useful since it always logged true. | 
| +  </obsolete> | 
| <owner>zea@chromium.org</owner> | 
| <summary> | 
| Whether OAuth2 refresh token was available at the time when | 
|  |