This reverts commit 92db073f.

Reason for revert: Breaks devtools test https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8-Blink%20Win/15539

Devtools seems to parse our error messages, e.g. https://cs.chromium.org/chromium/src/third_party/blink/renderer/devtools/front_end/object_ui/JavaScriptAutocomplete.js?type=cs&q=isExpressionComplete+javascriptautocomplete&sq=package:chromium&g=0&l=612

Original change's description:
> [parser] Improve error message for unclosed function bodies
> 
> This patch changes the output from:
> 
>   function fn() {
>                 ^
>   SyntaxError: Unexpected end of input
> 
> to:
> 
>   function fn() {
>                 ^
>   SyntaxError: missing '}' after function body
> 
> Bug: v8:6513, v8:7321
> Change-Id: I4ca8a40fa0be246da2a3ff776b3fb3c87b4ba4e0
> Also-By: gsathya@chromium.org
> Reviewed-on: https://chromium-review.googlesource.com/c/1367448
> Commit-Queue: Mathias Bynens <mathias@chromium.org>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58116}

TBR=marja@chromium.org,gsathya@chromium.org,mathias@chromium.org

Change-Id: Ia2ac413d67fda39eda903c056002ae632df73df9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6513, v8:7321
Reviewed-on: https://chromium-review.googlesource.com/c/1370026Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58124}