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This CL fixes/updates obsolete TODOs in remoting/ios, along with some
other small cleanups nearby.

Bug: 786616
Change-Id: I29b5e41a6dabb2f314a6e4fadc3fa443d1a55328
Reviewed-on: https://chromium-review.googlesource.com/783663
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519920}