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Moved methods that are meaningful for xdg to XdgShellSurface, and ones for remote_shell to ClientControlledShellSurface.

Updated the unit test to use the correct ShellSurface instance.
I found that a few tests used wrong one (that never actually used in real scenario), so I fixed them.
There is one test that was failing because it's testing the scenario that does not exist. I'll
fix it in a follow up CL.

Bug: 773461
Change-Id: I91124da7c6274cd3dabc2e49e2abca1034dadffd
Reviewed-on: https://chromium-review.googlesource.com/770454
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520717}