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The drag handler delegate should receive the resulting drag and drop
operation via its OnDragFinished, but the Ozone/X11 implementation
returned 0 always.  This CL fixes that.

Bug: 1014860
Change-Id: Ie339b7c7beb374bc58d08a332c2b817b8dc0b04f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253738Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#780207}