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This reverts commit 6f0c3820.

Reason for revert: StackSamplerImplTest.CopyStackTimestamp is crashing on MSan bots.
https://ci.chromium.org/p/chromium/builders/ci/Linux%20MSan%20Tests/21249
https://ci.chromium.org/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/16883

Original change's description:
> [Sampling profiler] Provide timestamp with sample
> 
> Records timestamps along with samples and plumbs them through to
> the ProfileBuilder interface. The CallStackProfileBuilder subclass
> will be updated in a following CL to record the timestamps, to
> support retrospective tagging of metadata on the samples.
> 
> Bug: 1034758
> Change-Id: Ic631d47773db5ce8ed5117c08aba5d5931cb7884
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972931
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
> Reviewed-by: oysteine <oysteine@chromium.org>
> Commit-Queue: Mike Wittman <wittman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#726526}

TBR=thestig@chromium.org,wittman@chromium.org,oysteine@chromium.org,etiennep@chromium.org

Change-Id: I752676dd15b9a6e2aad897c4c9442eaad1dda9b3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1034758
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977893Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726675}