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Segfaults were observed when running under Wayland compositors that do
not advertise primary selection protocol extension objects. For now,
Ozone/Wayland supports only gtk_primary_selection version 1, which is
likely not available in some compositors, such as, weston, sway, etc.
This fixes the crashes by properly handling cases where the gtk primary
selection protocol objects are not in place.

R=msisov@igalia.com

Bug: 1064410
Change-Id: Ia90b423208e64919f717442309a4c92cdb6749a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2118237Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#753161}