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Also a minor cleanup making GpuPreferences const.

TBR=boliu@chromium.org,tsepez@chromium.org

Bug: 785008
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: I865682dc09a817a2d05a1ee9a410be5510f6bef9
Reviewed-on: https://chromium-review.googlesource.com/1091072
Commit-Queue: Jonathan Backer <backer@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565406}