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This reverts commit eb07cea1.

Reason for revert: Windows tryjobs are failing.
https://logs.chromium.org/v/?s=chromium%2Fbb%2Ftryserver.chromium.win%2Fwin-msvc-rel%2F81420%2F%2B%2Frecipes%2Fsteps%2Fanalyze%2F0%2Fstdout for an example.

ERROR at //base/BUILD.gn:1802:33: Undefined identifier in string expansion.
    "CAN_UNWIND_WITH_CFI_TABLE=$can_unwind_with_cfi_table",
                                ^------------------------
"can_unwind_with_cfi_table" is not currently in scope.
See //BUILD.gn:65:5: which caused the file to be included.
    "//base:base_perftests",
    ^----------------------
GN gen failed: 1

Original change's description:
> Enable extracting unwind table on official builds without channel
> 
> This CL enables extraction of unwind tables for chrome when
> is_official_build is set to true and when android_channel is not set to
> a release channel. This affects build time only on official builds.
> Also, Set legacy heap profiler to use unwinder for profiling.
> 
> TBR=dpranke@chromium.org
> BUG=819888
> 
> Change-Id: If9732b5ac1f9dff49c58e88e2ffb6cb387715244
> Reviewed-on: https://chromium-review.googlesource.com/976944
> Reviewed-by: Siddhartha S <ssid@chromium.org>
> Reviewed-by: agrieve <agrieve@chromium.org>
> Commit-Queue: Siddhartha S <ssid@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#546425}

TBR=dpranke@chromium.org,ssid@chromium.org,agrieve@chromium.org

Change-Id: Id033094871dfcf74248f631390f15f379d9cd3c7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 819888
Reviewed-on: https://chromium-review.googlesource.com/983893Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546478}