Revert of headless: Add a dummy include for version.h (patchset #1 id:1 of...

Revert of headless: Add a dummy include for version.h (patchset #1 id:1 of https://codereview.chromium.org/2708643003/ )

Reason for revert:
Looks like this isn't needed after all.

Original issue's description:
> headless: Add a dummy include for version.h
>
> Add a dummy include for the generated version.h to make sure it will
> always be available for users of the headless API.
>
> BUG=546953
> TBR=altimin@chromium.org
>
> Review-Url: https://codereview.chromium.org/2708643003
> Cr-Commit-Position: refs/heads/master@{#451595}
> Committed: https://chromium.googlesource.com/chromium/src/+/e859ab1300be6e103b62bc5409214e5584287815

TBR=altimin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=546953

Review-Url: https://codereview.chromium.org/2706073003
Cr-Commit-Position: refs/heads/master@{#451620}