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This reverts commit 1501aabf.

Reason for revert: crbug.com/877063 speculative fix.
Original change's description:
> Clang: stop building with GCC/libstdc++ from Ubuntu Precise (roll 338452-1:338452-2)
> 
> Previously we used a GCC/libstdc++ package from Ubuntu Precise to build a Clang
> that would work on Precise or later. These days, all bots and developers are on
> Trusty or later, so this should no longer be necessary.
> 
> Bug: none
> Change-Id: I518ee55d07c04dc89163fe262c81d935e05fed78
> Reviewed-on: https://chromium-review.googlesource.com/1183915
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Commit-Queue: Hans Wennborg <hans@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#585067}

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

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

Bug: none
Change-Id: I632e2e47d856d2c7df7e629f12068903e149d166
Reviewed-on: https://chromium-review.googlesource.com/1187344Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585673}