Reason for revert:
Tentatively reverting because it made the sizes bot grumpy (http://build.chromium.org/p/chromium/buildstatus?builder=Linux&number=52715)
Original issue's description:
> linux: Always use (64bit) gold for linking, even on 32bit.
>
> All 32bit bots now have 64bit kernels and can run 64bit gold. So always use
> that. We already require running 64bit binaries for clang, and the official
> bots already used to do this for gold. This makes linking on 32bit bots faster,
> and simplifies our configurations.
>
> BUG=396333
> TBR=brettw
>
> Committed: c7864673b1TBR=thestig@chromium.org,brettw@chromium.org,thakis@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=396333
Review URL: https://codereview.chromium.org/482173003
Cr-Original-Commit-Position: refs/heads/master@{#291905}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 277720168a1fd1bd3147912fc81c88f6dc0f1c69
cd44b988a8