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This change replaces usage of content::BrowserGpuMemoryBufferManager
with viz::HostGpuMemoryBufferManager.

With this change BrowserGpuMemoryBufferManager is not needed anymore and
code to handle buffer allocation in GpuProcessHost is also removed.

BUG=733482

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I6a9387e2e33a5d98d4ed7559618f4995256bafa4
Reviewed-on: https://chromium-review.googlesource.com/1095815
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584455}