Extend expiration of PasswordManager.TimeBetweenStoreAndServer

With the launch of the new server we should keep this for longer to observe
regressions.

Bug: 948336
Change-Id: I02f9fc982dfd7eae4d647457129d978346de480b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1581807
Auto-Submit: Dominic Battré <battre@chromium.org>
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654204}
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index d16e173..90599a2f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -88724,7 +88724,7 @@
 </histogram>
 
 <histogram name="PasswordManager.TimeBetweenStoreAndServer" units="ms"
-    expires_after="2019-05-01">
+    expires_after="2019-10-01">
   <owner>battre@chromium.org</owner>
   <owner>dvadym@chromium.org</owner>
   <summary>