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This reverts commit e3cf0f78.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Disable subpixel positioning on chrome os
> 
> Subpixel positioning was needed because text layout was performed at 1x
> device scale factor and then rastered to the final display device scale
> factor leading to glyph artifacts and inconsistent glyph positioning.
> With pixel canvas enabled on chrome os, the text layout is now always
> performed at the final display device scale factor. This, coupled with
> the replacement of ui scale with display zoom, the text on Chrome OS
> is now always rastered with the correct glyph positioning and it no
> longer requires subpixel positioning.
> 
> Bug:835187,824154,716662
> Change-Id: Idc0d6c7851308cc26b1d90f74a619e90dadf0112
> Component: Text render, subpixel positioning, font
> 
> TBR=derat@chromium.org
> 
> Change-Id: Idc0d6c7851308cc26b1d90f74a619e90dadf0112
> Reviewed-on: https://chromium-review.googlesource.com/1026636
> Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#553353}

TBR=derat@chromium.org,malaykeshav@chromium.org

Change-Id: I22601786db33c0082480a09e9e7a3905a56a1383
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 835187, 824154, 716662
Reviewed-on: https://chromium-review.googlesource.com/1026438Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553392}