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This CL adds a nullptr check for a missing web contents during MIX-DL
infobar dismissal on Android.

The vast majority of the time, this web contents should be available.
In the event that it's missing, since this infobar is purely
informational, this CL just allows the download to continue rather
crashing.

Bug: 1136156
Change-Id: I914c5ecaeea983725e228d572eab6154832b09f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458448
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Auto-Submit: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814883}