Revert of Move WTF::SpinLock to base::SpinLock. (patchset #4 id:60001 of https://codereview.chromium.org/2484803003/ )

Reason for revert:
Broke Android Cronet ARMv6 Builder:
https://build.chromium.org/p/chromium.android/builders/Android%20Cronet%20ARMv6%20Builder/builds/3565

Original issue's description:
> Move WTF::SpinLock to base::SpinLock.
>
> This CL depends on https://codereview.chromium.org/2473153003 ("Move some
> compiler intrinsic #defines to base/.").
>
> BUG=632441
>
> Committed: https://crrev.com/d9dbd59434791ddc998d2aeb24f7f1326431ed14
> Cr-Commit-Position: refs/heads/master@{#433378}

TBR=esprehn@chromium.org,dcheng@chromium.org,hans@chromium.org,thakis@chromium.org,primiano@chromium.org,palmer@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=632441

Review-Url: https://codereview.chromium.org/2517033002
Cr-Commit-Position: refs/heads/master@{#433472}


CrOS-Libchrome-Original-Commit: d0f9937ffbecc604e21893ee38f2385550daa8c5
2 files changed
tree: 4d2f42c7b897dcdcd8626fe35aecd9dceb188474
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/