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r683358 introduced a bug where in a SpellCheckHost.CallSpellingService
message response callback may be dropped without being called whenever
the source render process has been terminated. That can result in a
DCHECK being hit in testing environments but is otherwise harmless.

This CL fixes the issue by ensuring that the response callback gets
called in the case where the process has been terminated.

Bug: 977637
Change-Id: I6d815be3cad8199c7f8bef27ac10f322b217f881
Tbr: thestig@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732678Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#683506}