Revert "[node] reset node checkout on v8 update"

This reverts commit ccfa4ca7.

Reason for revert: Infra supports this now.

Original change's description:
> [node] reset node checkout on v8 update
> 
> This is a temporary measure to get bots back in order.
> 
> Bug: chromium:860430
> 
> TBR=machenbach@chromium.org
> 
> Change-Id: I3275150f4bc5dfe8ab90984e15f8a1a469d70caf
> Reviewed-on: https://chromium-review.googlesource.com/1127166
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Commit-Queue: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54269}

TBR=machenbach@chromium.org,yangguo@chromium.org

Change-Id: I6a74ab702fd32b278caebb665be6868b4712dffb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:860430
Reviewed-on: https://chromium-review.googlesource.com/1127721Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54287}

tools/node/update_node.py

@@ -81,12 +81,6 @@ def CommitPatch(options):
       cwd=options.v8_path,
   )
 
-def ResetTarget(path):
-  """Temporarily use this to clear the checkout on the bots"""
-  print ">> Resetting Node.js checkout"
-  subprocess.check_call(["git", "reset", "--hard"], cwd=path)
-  subprocess.check_call(["git", "clean", "-fxd"], cwd=path)
-
 def UpdateTarget(repository, options, files_to_keep):
   source = os.path.join(options.v8_path, *repository)
   target = os.path.join(options.node_path, TARGET_SUBDIR, *repository)
@@ -174,7 +168,6 @@ def Main(args):
   if options.gclient:
     RunGclient(options.v8_path)
   # Commit patch on trybots to main V8 repository.
-  ResetTarget(options.node_path)
   if options.with_patch:
     CommitPatch(options)
   # Update main V8 repository.