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Similar adapter observer methods have already been marked deprecated.
GattServiceChanged is not all too different since it is fired when
essentially the device changes shape (attributes are added/removed).

This change also removes a platform-specific use of
gatt_service_changed_count() and gatt_characteristic_added_count().

BUG=710352

Change-Id: Iffe8118083ec10ba762eacb18886bca3acda2d58
Reviewed-on: https://chromium-review.googlesource.com/776354
Commit-Queue: Conley Owens <cco3@chromium.org>
Commit-Queue: Vincent Scheib <scheib@chromium.org>
Reviewed-by: Vincent Scheib <scheib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517498}