Revert of linux: Always use (64bit) gold for linking, even on 32bit.

Revert of linux: Always use (64bit) gold for linking, even on 32bit. (patchset #3 of https://codereview.chromium.org/503873004/)

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: https://chromium.googlesource.com/chromium/src/+/c7864673b16236a2ec3cd435bb11608cbb76c1b4

TBR=thestig@chromium.org,brettw@chromium.org,thakis@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=396333
Committed: https://crrev.com/277720168a1fd1bd3147912fc81c88f6dc0f1c69
Cr-Commit-Position: refs/heads/master@{#291905}

[noms (inactive), 2014-08-26 15:20:19]

Created Revert of linux: Always use (64bit) gold for linking, even on 32bit.

[commit-bot: I haz the power, 2014-08-26 15:20:41]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/noms@chromium.org/482173003/1

[commit-bot: I haz the power, 2014-08-26 15:21:39]

Committed patchset #1 (1) as c37f5c0ba600877ca3475acc1c88c744ed165c2d

[commit-bot: I haz the power, 2014-09-10 02:42:53]

Patchset 1 (id:??) landed as
https://crrev.com/277720168a1fd1bd3147912fc81c88f6dc0f1c69
Cr-Commit-Position: refs/heads/master@{#291905}