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This reverts commit 5906c258.

Reason for revert: It breaks release component builds (see crbug.com/1098761).

Original change's description:
> Abseil component build (default symbols visibility).
>
> This CL introduces an Abseil component on which all Chromium Abseil
> clients will have to depend on.
>
> Abseil doesn't export symbols explicitly, so for the moment Chromium
> exports all of them when is_component_build=true. On Android, Linux and
> Mac -fvisibility=default is used while on Windows a .def file is
> generated at Abseil roll time.
>
> Bug: 1046390
> Change-Id: I1697eb9e0179cee01badcf1b687acd94160e5f6d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2174434
> Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#781225}

TBR=thakis@chromium.org,mbonadei@chromium.org

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

TBR=thakis@chromium.org

Bug: 1046390, 1098761
Change-Id: I7d456be38a42f1ea0a130e1a5305c3d515e26588
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264060
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781928}