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Similar to Bug: 783199, when user have two monitors that set to
different scales, PWA may relaunch off the screen.
This change does a similar fix for PWA as the original change did
for devtools.

Bug: 1046481
Change-Id: I63230b01c59c5f277298c5bc5e51c8703cc6f54a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2074799
Commit-Queue: Junyi Xiao <juxiao@microsoft.com>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Lorne Mitchell <lomitch@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#755007}