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In https://bugs.chromium.org/p/chromium/issues/detail?id=1005096, I
fixed a crash in HTTP Auth committed interstitials by changing a
GetVisibleEntry() to a GetPendingEntry(), and I reasoned that
GetPendingEntry() should always be non-null at this point. It turns
out, I reasoned wrong. It seems that there is some interleaving of
navigations starting and getting cancelled where the pending entry is
null when processing a main-frame response. So this CL adds a null
check before accessing the pending entry.

Bug: 1015787,1006955
Change-Id: I70e06e6c8aeee6db93c5797593d4eda6cd5c906d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869299
Commit-Queue: Emily Stark <estark@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707602}