Revert of [debug] Consistently use script from FrameMirror (patchset #3 id:40001 of https://codereview.chromium.org/2415073003/ )

Reason for revert:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/10706

https://github.com/v8/v8/wiki/Blink-layout-tests

Original issue's description:
> [debug] Consistently use script from FrameMirror
>
> ... instead of getting it from the FunctionMirror. For WASM frames
> (including asm.js -> WASM), the function is either unresolved or does
> not contain the script.
>
> The added test case failed before this CL.
>
> R=kozyatinskiy@chromium.org, yangguo@chromium.org, titzer@chromium.org
> BUG=v8:4203
>
> Committed: https://crrev.com/ce32e2ffd835062d764f3c0ee6a32543417cb615
> Cr-Commit-Position: refs/heads/master@{#40348}

TBR=kozyatinskiy@chromium.org,yangguo@chromium.org,titzer@chromium.org,clemensh@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4203

Review-Url: https://codereview.chromium.org/2427633002
Cr-Commit-Position: refs/heads/master@{#40362}