Revert "Android: Enable in-tree libc++ builds"

This reverts commit dc6ff4ef543f5491073f442c1fae7928024da5eb.

Reason for revert: Binary size regression of almost 880 KB.

Original change's description:
> Android: Enable in-tree libc++ builds
> 
> BUG=767901
> R=​thakis
> CC=​pcc
> 
> Change-Id: Ib394126f8e729192ee41520eefd85e22531bfd65
> Reviewed-on: https://chromium-review.googlesource.com/1066596
> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#561361}

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

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

Bug: 767901, 846745
Change-Id: Ie330b21911f3d4a75c114d488efa3a705ad8616a
Reviewed-on: https://chromium-review.googlesource.com/1073489
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#561971}(cherry picked from commit 119cc54d861f083cfa7b5268c1a536f361665e8e)
Reviewed-on: https://chromium-review.googlesource.com/1085787
Cr-Commit-Position: refs/branch-heads/3440@{#154}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
2 files changed