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MessageLoop is going away. Also had to fix a lot of includes as a bunch
of files were not directly including their dependencies.

Bug: 891670
Change-Id: I1b962b9513596b399175498278ad526fba2240f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807504
Commit-Queue: Carlos Caballero <carlscab@google.com>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699658}