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Most other platforms either unconditionally, or are moving towards unconditionally
building with custom libcxx.

This comment suggests that there was always the intention to move
unconditionally to libc++:
https://bugs.chromium.org/p/chromium/issues/detail?id=554841#c3

And this bug suggests that we're already paying most of the engineering
cost for making this config work:
https://bugs.chromium.org/p/chromium/issues/detail?id=996754

Change-Id: I030f65b5921c4f5572fafcaf975eff24e804f3ed
Bug: 1043560
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010226
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733362}