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To improve code maintainability, this CL clarifies thread affinity of
initialization and shutdown functions in worker classes. This does not change
any existing behavior.

Bug: 741227
Change-Id: I25fe7278130c90292b79cdd5607f10a0ef92f198
Reviewed-on: https://chromium-review.googlesource.com/567609
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486740}