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In order to get the DWM full screen optimization and save power, the
overlay size must match the screen size when in fullscreen mode. If
there are a few pixels off, this CL adjusts the overlay size to fit the
screen.

Remove |disable_larger_than_screen_overlays| workaround since this is
now handled by this fullscreen size adjustment function.

Bug: 720059, 1027046
Change-Id: I08feb0ec42d0ae3157e64edac4b467795cf426f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508203
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826943}