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Currently when swiping up from bottom to drag a window, the window can
be ended in 4 different places: restore to its old position, go to home
screen, drop in overview, or snap in splitview. These operations are
handled in different places, with the first 2 handled in
FinalizedDraggedWindow() function and the latter 2 handled in
EndDrag() function. The reason for it to avoid window state change to
interfere with shelf state change, see https://crrev.com/c/2004052.

This CL moves the logic of window finalization operations together while
keeping the existing logic unchanged.

This CL doesn't have any functional change.

Bug: None
Change-Id: Ib2c4e866893c51ee952725a3b80c701f8b02120a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320770Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792108}