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This is a reland of 5930a9fd

Original change's description:
> ozone/wayland: Fix data objects initialization and ownership
> 
> DataDevice-related wrappers initialization and ownership, for both
> standard and GTK's primary selection, are quite confusing and spread
> over different parts of the backend code. This CL fixes and simplifies
> it by:
> 
> - Moving {WaylandData,GtkPrimarySelection}Device ownership to their
> respective DataManager wrapper class. E.g: WaylandDataDeviceManager owns
> WaylandDataDevice singleton;
> 
> - Fix WaylandClipboard initialization whether the compositor happens to
> advertise GtkPrimarySelectionDeviceManager after wl_seat and
> wl_data_device_manager;
> 
> - Use dependency injection to provide DataSources with the correct
> DataDevice instance at their construction time;
> 
> - Clean up WaylandConnection by getting rid of the multiple (and almost
> unused) data device getters from it as well as removing unneeded header
> includes.
> 
> Bug: 896640
> Change-Id: Ie12964fdf4e7b78bbbd9a11e133ab082613f1c7b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216320
> Reviewed-by: Maksim Sisov <msisov@igalia.com>
> Commit-Queue: Nick Yamane <nickdiego@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#773235}

Bug: 896640
Change-Id: I52ec359c5339847674ab0ab8f89a96c15ededf59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225502
Auto-Submit: Nick Yamane <nickdiego@igalia.com>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#774031}