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This reverts commit ffff90fd.

Reason for revert: Consistently failing on multiple ChromeOS bots. https://crbug.com/1018615

Original change's description:
> [Sampling profiler] Implement signal-based stack copying in //base/profiler
> 
> This CL extracts the core stack copying parts of
> tracing::StackUnwinderAndroid into the dedicated base::StackCopierSignal
> class, and adapts it for direct use by the sampling profiler stack
> unwinding implementation. This drops some unneeded code; updates the code
> to run on 32-bit Android, 64-bit Android, and 64-bit Linux platforms;
> and converts the code to use C++ atomics.
> 
> The StackUnwinderAndroid implementation will eventually be replaced
> wholesale by the sampling profiler implementation for Android. This CL
> does not attempt to reuse the extracted stack copying implementation on
> its own, in order to avoid introducing bugs in StackUnwinderAndroid due
> to the differing implementations.
> 
> TBR=gab@chromium.org
> 
> Bug: 988579
> Change-Id: I0293771679c5deae69fdbb007d8828ead575ee0f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872967
> Reviewed-by: Mike Wittman <wittman@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Reviewed-by: Charlie Andrews <charliea@chromium.org>
> Reviewed-by: ssid <ssid@chromium.org>
> Commit-Queue: Mike Wittman <wittman@chromium.org>
> Commit-Queue: Gabriel Charette <gab@chromium.org>
> Auto-Submit: Mike Wittman <wittman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#709597}

TBR=gab@chromium.org,wittman@chromium.org,ssid@chromium.org,charliea@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 988579
Change-Id: Ib62446f431d971f2403b1fb9fcebaa130559c698
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882190Reviewed-by: Meredith Lane <meredithl@chromium.org>
Commit-Queue: Meredith Lane <meredithl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709785}