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Removed the need for set_owned_by_client() in EditingHandleView.

Fixed ownership semantics for the Widget holding EditingHandleViews
to eliminate the use of WIDGET_OWNS_NATIVE_WIDGET. Currently this
ownership model is aimed primarily at enabling easier testing and is
in the process of being removed.

Bug: 1044687
Change-Id: I51861ca2d9f2a505d86f92fe208868a562f585b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218502
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774690}