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The crash seems to happen because the delegate is deleted potentially
while a call to Java is still pending. I assume (but am not sure) that
JNI calls are put into the message queue and not executed immediately.

The workaround for now is to use callbacks instead of a dedicated
delegate, thereby circumventing lifecycle issues of the delegate.

Bug: b/169129405
Change-Id: I6e34874141792df47a117cd1f7f045759f852254
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423885
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809357}