Revert of Revert of Wrap runtime.js in a function. (patchset #1 id:1 of https://codereview.chromium.org/1123353004/)

Reason for revert:
Failing test has been fixed.

Original issue's description:
> Revert of Wrap runtime.js in a function. (patchset #2 id:20001 of https://codereview.chromium.org/1126213002/)
>
> Reason for revert:
> [Sheriff] Breaks nosnap:
> http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap/builds/2872
>
> Original issue's description:
> > Wrap runtime.js in a function.
> >
> > R=jkummerow@chromium.org
> >
> > Committed: https://crrev.com/65c56d49b2d671ac9e379de726bff3eb03a508c1
> > Cr-Commit-Position: refs/heads/master@{#28275}
>
> TBR=jkummerow@chromium.org,yangguo@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/62bd294f909ff448d0f876a3d745966a24cdc3f7
> Cr-Commit-Position: refs/heads/master@{#28277}

TBR=jkummerow@chromium.org,machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1131843002

Cr-Commit-Position: refs/heads/master@{#28287}