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This CL
1) extracts ShellObjectFactory into a separate file and keeps
the same creation and initialization logic of wrappers of shell objects,
2) extends ShellPopupWrapper and ShellSurfaceWrapper interfaces by adding
Initialize method so that it is more convenient to initialize
XdgPopupWrapperImpl XdgSurfaceWrapperImpl and let them handle initialization
based on the available xdg-shell version,
3) makes WaylandWindow use the extracted ShellObjectFactory,
4) makes InitializeStable and InitializeV6 methods of
XDGWrapper objects be private members. The decision on which
one to call is made in the main Initialize method now.
5) reconsiders the logging whether we need to keep pointers to
some objects or not.

Bug: 1028919
Change-Id: I87fd5fc0d0b35222f26c460c9174da6053dc320e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1953708Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#722572}