Revert "Enable thinlto on caroline and terra release builds."

This reverts commit 434f4eef1a0f545c548ed86c5033fbd4dd523e8d.

Reason for revert: crbug.com/799642

Original change's description:
> Enable thinlto on caroline and terra release builds.
>
> We want to enable thinlto on Chrome for better performance and
> CFI. As a first step, we enable two AMD64 boards first.
> The design doc and the performance numbers can be found at the
> bug entry.
>
> BUG=chromium:707803
> TEST=cbuildbot caroline-release terra-release
>
> Change-Id: Ia49fd06603bc601ba970d80470146f909dbd4f4a
> Reviewed-on: https://chromium-review.googlesource.com/790753
> Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
> Tested-by: Yunlian Jiang <yunlian@chromium.org>
> Reviewed-by: Caroline Tice <cmtice@chromium.org>

Bug: chromium:707803
Change-Id: I6cc26fa3cb0b95c102a5f3382c1594f444403990
Previous-Reviewed-on: https://chromium-review.googlesource.com/889182
(cherry picked from commit 518a855efeba72b5d17b7315c940b07a41b9270a)
Reviewed-on: https://chromium-review.googlesource.com/890393
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Trybot-Ready: Yunlian Jiang <yunlian@chromium.org>
2 files changed