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This reverts commit 01b9624c.

Reason for revert: first of two reverts to fix https://ci.chromium.org/p/chromium/builders/try/android_compile_x64_dbg/1504

Original change's description:
> [Sampling profiler] Provide unwinder in stack_unwinder DFM
> 
> Implements the Android native/Java stack unwinder within the stack_unwinder
> dynamic feature module.
> 
> Adds visibility/assert_no_deps constraints to //base/BUILD.gn to avoid
> leaking module implementation types into general Chrome code, which
> would defeat the purpose of using the module to avoid Chrome binary size
> increase.
> 
> Adds required stub declarations/implementation for MemoryRegionsMap.
> 
> Bug: 1083530, 1004855
> Change-Id: If9d31c4e1b9d214bb0baabe3afa8475ba7adef4a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209297
> Commit-Queue: kylechar <kylechar@chromium.org>
> Reviewed-by: kylechar <kylechar@chromium.org>
> Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
> Auto-Submit: Mike Wittman <wittman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#771018}

TBR=wittman@chromium.org,kylechar@chromium.org,etiennep@chromium.org

Change-Id: I992dcf2c36b13ef51d323a44fef840e1e04bdd7b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1083530, 1004855
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2211927Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771046}