Bug 1592400 - Update Browsertime version used in-tree. r=perftest-reviewers,rwood,dpalmeiro

This patch updgrades the current version used in-tree so that browsertime works with chrome, it currently timesout with that browser.

Differential Revision: https://phabricator.services.mozilla.com/D50999

--HG--
extra : moz-landing-system : lando

tools/browsertime/package.json

@@ -5,7 +5,7 @@
   "license": "MPL-2.0",
   "dependencies": {},
   "devDependencies": {
-    "browsertime": "https://github.com/mozilla/browsertime/tarball/c795660ef1e589dfb8bf01397782811934c90696"
+    "browsertime": "https://github.com/mozilla/browsertime/tarball/d3951b5b097d3685fed7a025dee709994cd0bcaf"
   },
   "notes(private)": "We don't want to publish to npm, so this is marked as private",
   "private": true