Should we consider 900px instead of 840px to trigger closing the side nave drawer?

https://folio.googleplex.com/chrome-ux-specs-and-sources/Chrome%20Inner%20Pages/03-Settings/specs#%2FSPEC-settings_structure-responsive.png%3Fz=width&c=show

bettes@ says in folio that we can go ahead with 900px

dschuyler's https://codereview.chromium.org/1940053002 improves the drawing-hiding width (landed already)

drawer-hiding**

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fc341c7887e4b2d2a79317ab22c8b5f5494a4a0c

commit fc341c7887e4b2d2a79317ab22c8b5f5494a4a0c
Author: dbeam <dbeam@chromium.org>
Date: Wed May 04 05:04:18 2016

MD Settings: make the background color of the collapsed nav drawer white

Also makes the drawer hotdogs button stop shrinking.

R=dschuyler@chromium.org
BUG= 608519 
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/1939373002
Cr-Commit-Position: refs/heads/master@{#391448}

[modify] https://crrev.com/fc341c7887e4b2d2a79317ab22c8b5f5494a4a0c/chrome/browser/resources/settings/settings_menu/settings_menu.html
[modify] https://crrev.com/fc341c7887e4b2d2a79317ab22c8b5f5494a4a0c/chrome/browser/resources/settings/settings_ui/settings_ui.html
[modify] https://crrev.com/fc341c7887e4b2d2a79317ab22c8b5f5494a4a0c/chrome/browser/resources/settings/settings_ui/settings_ui.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c549bc02989c26fd72c3e8c1f9268444e41f1a56

commit c549bc02989c26fd72c3e8c1f9268444e41f1a56
Author: dbeam <dbeam@chromium.org>
Date: Wed May 11 00:36:22 2016

MD Settings: remove shadow from drawer in narrow mode, change font color

R=dschuyler@chromium.org
BUG= 608519 
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/1960983004
Cr-Commit-Position: refs/heads/master@{#392788}

[modify] https://crrev.com/c549bc02989c26fd72c3e8c1f9268444e41f1a56/chrome/browser/resources/settings/settings_ui/settings_ui.html