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Currently, default resolution is set to 2880x1800.
This CL now sets it to the actual screen size.

Bug: 257097
Change-Id: I547262c563453e31cd8be30e79148d4b92d8c90a
Reviewed-on: https://chromium-review.googlesource.com/989531
Commit-Queue: Chandan Padhi <c.padhi@samsung.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547433}