EXO: Move WaylandPointerDelegate out of server.cc

This CL only moves code around.

Bug: 896710
Test: Built on ChromeOS
Change-Id: Id9567918d751a9768d00489b5532a1abea3490e6
Reviewed-on: https://chromium-review.googlesource.com/c/1318083
Commit-Queue: Shawn Gallea <sagallea@google.com>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608106}
4 files changed