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Now that viz::mojom::GpuHost implementation has moved out of content,
viz::GpuClient can directly call on that to establish a gpu channel and
we can remove the functionality from GpuClientDelegate.

BUG=709332

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ied5a8ead810973068190e3ce485609f68f5826d5
Reviewed-on: https://chromium-review.googlesource.com/1188883
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587852}