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This CL maintains the reference to the C++ instance, and handles the
null response case better.

Bug: 949269
Change-Id: I3bb453286d8a1f8c8f087787235a664570e2c259
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2200045Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#772413}