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This reverts commit 6e2e384b.

Reason for revert: Not sure why, but seems a pretty clear culprit for crbug.com/882832

Original change's description:
> Update bundled Chrome app icon for MD compliance
> 
> - Update chrome_app manifest to support 32 and 192px icons.
> - Use 192px icon as window icon for Chrome browser.
> - Move all resource handing related to chrome_app under
>   OS_CHROMEOS ifdef.
> 
> Bug: 879618
> Test: manual
> Change-Id: If3e9fb396424159ea0bf7f2cf61febfd89838b62
> Reviewed-on: https://chromium-review.googlesource.com/1210943
> Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#589771}

TBR=kaznacheev@chromium.org,oshima@chromium.org,thestig@chromium.org

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

Bug: 879618
Change-Id: Idd28ce462ab64d417e4c6137a8ecbc7966975f42
Reviewed-on: https://chromium-review.googlesource.com/1219908Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590348}