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The |draggingLocation| of NSDraggingInfo is a point based on the
NSWindow coordinate and it should be converted to gfx::Point
using |contentRectForFrameRect:| instead of |frame| because the
NSWindow may have title bar.

Bug: 954019
Change-Id: I92e45aa5fb8aab07c2540cc97b5bd76e29e43a5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573358Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654804}