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

Review URL: https://codereview.chromium.org/1123353004

Cr-Commit-Position: refs/heads/master@{#28277}