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Currently, X11ClipboardOzone continues to keep the request even
though OnSelectionNotify comes. This may result in clients waiting
until the request is processed or sending another request at the
same time as the request is being processed. Thus, after I looked
at how non-Ozone/X11 handle selection notify, copy the logic that
SelectionRequestor::OnSelectionNotify has and complete
the request with empty data.

Fixes the following tests:
SafeBrowsingBlockingPageWithDelayedWarningsBrowserTest/SafeBrowsingBlockingPageDelayedWarningBrowserTest.Paste_*

Bug: 1084472
Change-Id: Iad7383f198b482549c9cff7f6b1183c9b8419470
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340909Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#796709}