Notify Java AutocompleteResult about broken relationship.

This change ensures we don't initiate calls to VerifyCoherency when
C++ breaks relationship.

Technically Native object continues to be valid, but its content may
not reflect what Java holds, leading to an unnecessary VerifyCoherency
call.

Added destructor call for completeness.

Change-Id: I114a9cc53a274c380fb5df9934d8ef1c030e6e0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4859268
Auto-Submit: Tomasz Wiszkowski <ender@google.com>
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Reviewed-by: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1196043}