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It's incorrect to include wayland-server-protocol-core.h file,
instead, one must include wayland-server-protocol.h.

This fix fixes that and unblocks building with
use_system_libwayland=true.

TBR=rjkroege@chromium.org

Test: build with use_system_libwayland=true
Bug: 1022750
Change-Id: Ie113b47992a9e50426a0e361498f12ec6d4d3de7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153162Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#760433}