mash: Move tray settings and deps to common.

tools/git/move_source_file.py ash/system/chromeos/devicetype_utils* ash/common/system/chromeos/
tools/git/move_source_file.py ash/system/chromeos/power/battery_notification* ash/common/system/chromeos/power/
tools/git/move_source_file.py ash/system/chromeos/power/dual_role_notification* ash/common/system/chromeos/power/
tools/git/move_source_file.py ash/system/chromeos/power/power_status* ash/common/system/chromeos/power/
tools/git/move_source_file.py ash/system/chromeos/power/tray_power* ash/common/system/chromeos/power/
tools/git/move_source_file.py ash/system/chromeos/settings/tray_settings* ash/common/system/chromeos/settings/
tools/git/move_source_file.py ash/system/system_notifier* ash/common/system/

Add ash_switches.h to allowed ash/common/DEPS; run "git cl format".
Convert tray_settings.cc ash::Shell uses to ash::WmShell.
Remove some unused shell[_delegate].h includes.

BUG=619636
TEST=compiles, ash_unittests
[email protected],[email protected]
[email protected]

Review-Url: https://codereview.chromium.org/2072013002
Cr-Commit-Position: refs/heads/master@{#400448}
65 files changed