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This way Window::GetBoundsInScreen() returns screen coordinates.

BUG=none
TEST=covered by tests

Change-Id: I701247ec7005b3f8bcedacbe7345154b51287a67
Reviewed-on: https://chromium-review.googlesource.com/c/1359305Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613284}