EXO: Change surface includes

Remove pointer.h include and replace with wm_helper.h include.
pointer.h is not needed, but wm_helper is needed as it was transitively
included through pointer.h.

Bug: 896710
Test: Built on ChromeOS
Change-Id: Ic3dea290b4662cc5d868e7568c4909257dd55122
Reviewed-on: https://chromium-review.googlesource.com/c/1324749
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Shawn Gallea <sagallea@google.com>
Cr-Commit-Position: refs/heads/master@{#606594}
1 file changed