chromeos: Move files in //ash/common/system/chromeos to //ash/system

Ash only compiles on chromeos so there's no need for special /chromeos
subdirectories. We're also getting rid of //ash/common, so just move
everything into //ash/system.

Mechanical file moves:
* //ash/system/chromeos -> //ash/system
* //ash/common/system/chromeos -> //ash/system

Also fix some bad include guards.

This is a mechnical move with tools/git/mass-rename.py. No behavior
changes.

BUG=666778
TEST=compiles, ash_unittests
[email protected]

Change-Id: I572565f83fe7a8c63e58693afd92f454b9ac8bb0

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Change-Id: I572565f83fe7a8c63e58693afd92f454b9ac8bb0
Reviewed-on: https://chromium-review.googlesource.com/471884
Commit-Queue: James Cook <[email protected]>
Reviewed-by: James Cook <[email protected]>
Cr-Commit-Position: refs/heads/master@{#463121}
223 files changed