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Currently GbmDevice is-a DrmDevice is-a GbmDeviceLinux. Instead, put a
GbmDevice inside DrmDevice. This also removes a bunch of unnecessary
casts.

Bug: 869206

Change-Id: If7ea97f495081ebf4d05f44af2bd78c3357e23da
Reviewed-on: https://chromium-review.googlesource.com/1157254Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579887}