Added missing enum value to AccessPasswordInSettingsEvent

Change-Id: I89c6a46f6c10c322096ecbdb41870bd87fa80995
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421889Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Viktor Semeniuk <vsemeniuk@google.com>
Cr-Commit-Position: refs/heads/master@{#808872}

tools/metrics/histograms/enums.xml

@@ -930,6 +930,7 @@ Unknown properties are collapsed to zero. -->
 <enum name="AccessPasswordInSettingsEvent">
   <int value="0" label="Viewed"/>
   <int value="1" label="Copied"/>
+  <int value="2" label="Edited"/>
 </enum>
 
 <enum name="AccountChooserDismissalReason">