Revert of [errors] Improve NotGeneric error message (patchset #3 id:40001 of https://codereview.chromium.org/2814043006/ )

Reason for revert:
Please schedule rebasing layout test first:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/15036

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

Original issue's description:
> [errors] Improve NotGeneric error message
>
> This changes the message from
>
> "method_name is not generic"
>
> to
>
> "method_name requires that 'this' be a primitive_name object"
>
> BUG=v8:6206
>
> Review-Url: https://codereview.chromium.org/2814043006
> Cr-Commit-Position: refs/heads/master@{#44683}
> Committed: https://chromium.googlesource.com/v8/v8/+/21b104e3b83569b52539ecaa83e68a3646065101

TBR=littledan@chromium.org,yangguo@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:6206

Review-Url: https://codereview.chromium.org/2825123002
Cr-Commit-Position: refs/heads/master@{#44701}