Add back a null-check that GetResourceLoadTiming() doesn't return null.

I made the mistake of believing a DCHECK that was in the codeā€¦

TBR=dcheng@chromium.org

(cherry picked from commit eb8a5f96c04184e9bfd0efab08fd4176c0ec24d3)

Bug: 803811
Change-Id: I536ff17c7bbb2ff23f199c9b51637f184d08966d
Reviewed-on: https://chromium-review.googlesource.com/876649
Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#530625}
Reviewed-on: https://chromium-review.googlesource.com/879345
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/branch-heads/3325@{#19}
Cr-Branched-From: bc084a8b5afa3744a74927344e304c02ae54189f-refs/heads/master@{#530369}
1 file changed