Revert of Use shared container to manage imports/exports. (patchset #2 id:20001 of https://codereview.chromium.org/1143993003/)

Reason for revert:
Breaks nosnap bots

Original issue's description:
> Use shared container to manage imports/exports.
>
> Also changed string.js and math.js to adapt this change.
>
> R=jkummerow@chromium.org
>
> Committed: https://crrev.com/e25058b0b7b9831162579564fc8935d568c1ecdd
> Cr-Commit-Position: refs/heads/master@{#28521}

TBR=yangguo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1144163002

Cr-Commit-Position: refs/heads/master@{#28523}