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Update includes and comments, and remove some unused code.

In particular, remove TODO comments for figuring out whether ARM
abs32 references can be 4 bytes long: Turns out ARM absolute
references are 8 bytes long. It's rel32 refereneces that can be
4 bytes long.

Change-Id: I02dc905885f6cb5ff929efe0fb1f9a6593ee05a8
Reviewed-on: https://chromium-review.googlesource.com/c/1327559Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606612}