DevTools: extend expiry of DevTools.Launch histogram

Fixed: chromium:1089720
Change-Id: I2844cc399d0a67cabf0df613ec4e2913dd01e364
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438053
Auto-Submit: Yang Guo <yangguo@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811809}

tools/metrics/histograms/histograms_xml/dev/histograms.xml

@@ -231,7 +231,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
   </summary>
 </histogram>
 
-<histogram base="true" name="DevTools.Launch" units="ms" expires_after="M85">
+<histogram base="true" name="DevTools.Launch" units="ms" expires_after="M94">
 <!-- Name completed by histogram_suffixes name="DevToolsLaunchPanels" -->
 
   <owner>yangguo@chromium.org</owner>