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If FileURLDirectoryLoader has a net::DirectoryLister instance running,
it continues to call MaybeTransferPendingData() until the listing
finishes. If a connection error happens on the mojo interface, it
results in resetting |data_producer_|, and it causes a null pointer
dereference.

This issue was introduced after the last branch-cut. So only m78 is
affected.

Bug: 990579
Change-Id: I58f73d59022f89c82409e5fc10a6cb2a419b94d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1735241Reviewed-by: Chris Mumford <cmumford@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684288}