Revert of Automatically download gold plugin for cfi builds. (patchset #1 id:1 of https://codereview.chromium.org/1303183005/ )

Reason for revert:
Breaks windows.

Original issue's description:
> Automatically download gold plugin for cfi builds.
>
> BUG=chromium:515782
> LOG=n
> NOTRY=true
>
> Committed: https://crrev.com/c8dbd2c477c47a34593a0e7deee55915425b4ac2
> Cr-Commit-Position: refs/heads/master@{#30556}

TBR=bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:515782

Review URL: https://codereview.chromium.org/1329653004

Cr-Commit-Position: refs/heads/master@{#30558}