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UpdateDefaultTarget can be used to update the default target value
that will be used to complete the observation if the controller
is destroyed before CompleteObservation is called.  A default value
may be added, changed, or removed.

Change-Id: I700ad31cb56e60a15e31c43367377336f4c1ad74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863593
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707972}