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FrameLoader::StopAllLoaders() has this explicit note:

    Warning: stopAllLoaders can and will detach the LocalFrame out from
    under you. All callers need to either protect the LocalFrame or
    guarantee they won't in any way access the LocalFrame after
    stopAllLoaders returns.

Check frame_'s existence after the call to prevent a NULL dereference.

Bug: 879366
Change-Id: I1e537374f59fbad7b069f9de63cfa3b6b2b2b00c
Reviewed-on: https://chromium-review.googlesource.com/1198022Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Timothy Gu <timothygu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587933}