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This reverts commit 52c31b74, to re-land
the original CL (https://chromium-review.googlesource.com/884996). The
viz_content_browsertests were failing because of a bug in the posix
shmem impl (in base/memory/shared_memory_helper.cc) when the pool is
being run in the VIZ process. For now, the tests have been added to the
viz_content_browsertests filter file; and once the root-cause issue has
been resolved, they can be re-enabled.

TBR=xjz@chromium.org,kylechar@chromium.org

Bug: 806635, 785072, 754872
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I0f419ce2aee170a0fbd966ff8e10bb99c3b7067f
Reviewed-on: https://chromium-review.googlesource.com/889934
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532322}