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This reverts commit e4542cf9.

Reason for revert: Broke Chrome OS.

Original change's description:
> Use use_x11 feature when preprocessing clipboard.mojom.
> 
> The |kSelection| enum value is only available for systems running X11.
> 
> Bug: 676224
> Change-Id: Icdd99c86712d6127a6ae81e74d17b189073e11ed
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163637
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
> Commit-Queue: Lei Zhang <thestig@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#762479}

TBR=dcheng@chromium.org,thestig@chromium.org,huangdarwin@chromium.org

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

Bug: 676224,1088233
Change-Id: I7ddf3dd99e78d0e5128691d3ef310d09ed848ce6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225846Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774291}