Revert of [debugger] Prevent shared function info duplicates (patchset #1 id:1 of https://codereview.chromium.org/1958153004/ )

Reason for revert:
[Sheriff] Speculative revert for https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/6700

Yang can tell you how to do the blink rebase dance if it was this CL.

Original issue's description:
> [debugger] Prevent shared function info duplicates
>
> Clear the list of shared function infos attached to a script before
> compiling for live edit in order to avoid duplicates. This was lost in
> 058deb27.
>
> R=yangguo@chromium.org
> BUG=
>
> Committed: https://crrev.com/592432977e6213364c243c396060c7b64687ddc3
> Cr-Commit-Position: refs/heads/master@{#36155}

TBR=yangguo@chromium.org,jgruber@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/1973433002
Cr-Commit-Position: refs/heads/master@{#36165}