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ScopedBlockingCall serves as a precise annotation of the scope that may/will
block for the scheduler. This CL moves ScopedBlockingCall from the call site
to the implementation of FilePathWatcher::Watch, which is more accurate.

Bug: 874080
Change-Id: I03cf5d28a2c4763c0c358699aff9f32d686b46b6
Reviewed-on: https://chromium-review.googlesource.com/1243366
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594782}