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This reverts commit 75a861f2.

Reason for revert: It turns out this is an upstream issue. See:

- https://chromium-review.googlesource.com/c/chromium/src/+/1482557
- https://github.com/Valloric/ycmd/pull/1193

Original change's description:
> [Vim/YCM] Fix missing system headers when YCM was built with its own libclang.
> 
> Bug: 932667
> Change-Id: I2eb9965da1eb3f9ad4a5ce103cf6e32d35019e48
> Reviewed-on: https://chromium-review.googlesource.com/c/1476105
> Auto-Submit: Sidney San Martín <sdy@chromium.org>
> Commit-Queue: Sidney San Martín <sdy@chromium.org>
> Commit-Queue: Asanka Herath <asanka@chromium.org>
> Reviewed-by: Asanka Herath <asanka@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#632846}

TBR=sdy@chromium.org,asanka@chromium.org

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

Bug: 932667
Change-Id: I5a684c91723d28470e1d903cd74674ce145b421b
Reviewed-on: https://chromium-review.googlesource.com/c/1483709Reviewed-by: Sidney San Martín <sdy@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634829}