Revert "chromeos: Enable SingleProcessMash (in-proc window service) by default"

This reverts commit badd8a0fab485b41aee70b4ed463868b7e218359.

Reason for revert: Breaks the Wi-Fi network password entry field
http://crbug.com/919183

Original change's description:
> chromeos: Enable SingleProcessMash (in-proc window service) by default
> 
> Turns on the window service (code in //services/ws) and uses it to back
> aura and views (code in //ui/aura/mus and //ui/views/mus). Runs the
> window service in-process.
> 
> A label "SingleProcessMash enabled" will appear on the desktop
> wallpaper to let developers and QA know the feature is enabled.
> The label will be removed in a separate CL before this feature
> goes to dev channel. Otherwise there are no visible changes.
> 
> Flips the former "single_process_mash_*" bot configs to
> "non_single_process_mash_*" and runs them with the feature disabled.
> This should keep the old code paths working until we're sure this
> feature will stick.
> 
> TBR=sky@chromium.org
> 
> BUG=918537
> TEST=single_process_mash_* bots
> 
> Change-Id: I58a30fd81ea12645b1aabc049c7e697ef1d9e72a
> Reviewed-on: https://chromium-review.googlesource.com/c/1393467
> Reviewed-by: Jun Mukai <mukai@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Commit-Queue: James Cook <jamescook@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#619508}

TBR=jamescook@chromium.org,mukai@chromium.org,sky@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 918537, 919183
Change-Id: Ic3b5f0dd5b941d6383fd7290a0a55b60eedce30d
Reviewed-on: https://chromium-review.googlesource.com/c/1396702
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620103}
5 files changed