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This reverts commit 50136be2.

Reason for revert:

This also fails consistently on Linux Trusty:

https://ci.chromium.org/p/chromium/builders/ci/linux-trusty-rel/14445

Sample failure:

[ RUN      ] CpuAffinityTest.SetThreadCpuAffinityMode
../../base/cpu_affinity_posix_unittest.cc:114: Failure
Value of: SetThreadCpuAffinityMode(thread_id, CpuAffinityMode::kLittleCoresOnly)
  Actual: false
Expected: true
Stack trace:
#0 0x55b884c793f3 base::CpuAffinityTest_SetThreadCpuAffinityMode_Test::TestBody()

../../base/cpu_affinity_posix_unittest.cc:119: Failure
Value of: SetThreadCpuAffinityMode(thread_id, CpuAffinityMode::kDefault)
  Actual: false
Expected: true
Stack trace:
#0 0x55b884c797da base::CpuAffinityTest_SetThreadCpuAffinityMode_Test::TestBody()

Original change's description:
> Reland "base: Add API to restrict thread affinity to little cores on Android"
> 
> This is a reland of 027aa92e
> 
> Relanding but disabling test on CrOS devices (some of our CrOS devices
> seem to have asymmetric CPUs that aren't covered by the test).
> 
> Original change's description:
> > base: Add API to restrict thread affinity to little cores on Android
> >
> > Adds functions that facilitate setting the CPU affinity of a given
> > thread or process to all little cores on the system.
> >
> > We intend to use this API to run a power experiment.
> >
> > Bug: 1111789
> > Change-Id: I6c3d32c2338e9f00464e8b6a8c96af93658a3ae2
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335176
> > Commit-Queue: Eric Seckler <eseckler@chromium.org>
> > Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> > Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#794998}
> 
> TBR: dcheng@chromium.org
> Bug: 1111789
> Change-Id: I59315ec0e9a1727986278a04fa5bde409143dfb5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339416
> Reviewed-by: Eric Seckler <eseckler@chromium.org>
> Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
> Auto-Submit: Eric Seckler <eseckler@chromium.org>
> Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
> Commit-Queue: Eric Seckler <eseckler@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#795126}

TBR=dcheng@chromium.org,skyostil@chromium.org,eseckler@chromium.org

Change-Id: I3be932b56d8b42e10a7179e5310d041c1b687c28
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1111789
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339395Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795203}