Revert of Introduce mkgrokdump to update tools/v8heapconst.py. (patchset #21 id:390001 of https://codereview.chromium.org/2809653003/ )

Reason for revert:
Test driver runs into assert:
https://build.chromium.org/p/client.v8/builders/V8%20Win64/builds/17082

Original issue's description:
> Introduce mkgrokdump to update tools/v8heapconst.py.
>
> - Migrate make grokdump to GYP and GN
> - Move code from d8 into stand-alone execution
> - Add test case to ensure it's up-to-date
>
> Review-Url: https://codereview.chromium.org/2809653003
> Cr-Original-Commit-Position: refs/heads/master@{#44687}
> Committed: https://chromium.googlesource.com/v8/v8/+/0cc0c130fa56f129c90c2a74cb01bda85df5e42a
> Review-Url: https://codereview.chromium.org/2809653003
> Cr-Commit-Position: refs/heads/master@{#44710}
> Committed: https://chromium.googlesource.com/v8/v8/+/477f00557458d383bd9ebef281890ba485ee882a

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

Review-Url: https://codereview.chromium.org/2826743003
Cr-Commit-Position: refs/heads/master@{#44711}