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Because ResourceBundleFileLoader waits for both a mojo::Remote and
mojo::Receiver to disconnect before destroying itself, it's possible for
the ResourceBundleFileLoader to still be alive but |client_| to be
disconnected. Therefore when ResourceBundleFileLoader::OnMimeTypeRead()
runs after |client_| is disconnected, attempts to call |client_| Mojo
methods will either DCHECK or crash.

Bug: 1156958
Change-Id: I4320c26a75dce2a73509d3b0653c443df0c77ac2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584725
Auto-Submit: Anand K Mistry <amistry@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836113}