GitLab

https://chromium-review.googlesource.com/c/chromium/src/+/2295780
added UKM around prefetch accuracy stats, which involved an added line
in PreconnectManager::TryToLaunchPreresolveJobs() that did not check
the WeakPtr before using it. This fixes that.

Change-Id: I3cdf84d0f84fb9cc59811817efb1bdd42d15cf38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309029Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790375}