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These callbacks would already be delivered by the similar scope inside the attribute
implementation. Methods already have only the inner scope.

Change-Id: I72bceec4d883d0dba5e93b2ec19156d3c88590e1
Reviewed-on: https://chromium-review.googlesource.com/662220Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501200}