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Display zoom is responsible for scaling when the flag is enabled so we
dont need to manualy set the device scale factor for external 4k
displays.

Bug: 851701
Change-Id: I7b2789fa233dda89d3f2dd5031b5507c4c64b1ed
Component: Display Change Observer, 4k, Scaling
Reviewed-on: https://chromium-review.googlesource.com/1096343Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566541}