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Part 4/4 to replace these namespace qualifications.

TBR=dcheng@chromium.org

Bug: 763556
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I31d6c69d73111165fb1bd8294cd0fe4e18ce96bd
Reviewed-on: https://chromium-review.googlesource.com/662561
Commit-Queue: Brett Wilson <brettw@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501199}