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This CL moves when the bitmap fetcher request is canceled. This change
is being made to reduce noise in a future CL (where the request_id_ will
be a collection of request IDs rather than just one). Along the way,
several presubmit warnings are addressed.

The overall intention is make a future CL clearer (less noisy).

Bug: None
Change-Id: I8455f7921c85b3bd9824e06355b7c1c068fec5b2
Reviewed-on: https://chromium-review.googlesource.com/1011284Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550699}