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Moved protocols under is_chromeos for selective compilation. These
protocols have ChromeOS dependencies and would not compile on other
platforms. This is needed for eventual compilation of exo on Chromecast.

Bug: 896710
Test: Run exo_unittests
Change-Id: Id30ebdc8bf8338cba9e21a87350ab206b6d6057c
Reviewed-on: https://chromium-review.googlesource.com/c/1328566Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611729}