libweave: Add removing of weave::Command::Observer

Not a problem yet, but this is a cleaner approach.

BUG=none
TEST='FEATURES=test emerge-gizmo buffet'

Change-Id: I1889ee293a3e1db34aad14a7166b7ebbe32a8c10
Reviewed-on: https://chromium-review.googlesource.com/290161
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Trybot-Ready: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
11 files changed
tree: 86c5084b95879f39695a69398b4f52a0a3afbb5f
  1. buffet/
  2. libweave/