pre-upload: drop dead code

BUG=None
TEST=`./pre-upload_unittest.py` passes

Change-Id: Ifc40d4843538d89aca36a987e240c36dea0fcdad
Reviewed-on: https://chromium-review.googlesource.com/262672
Trybot-Ready: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Steve Fung <stevefung@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/pre-upload.py b/pre-upload.py
index 41f8f30..64ce839 100755
--- a/pre-upload.py
+++ b/pre-upload.py
@@ -1054,12 +1054,6 @@
                         ':\n' + stdout if stdout else ''))
 
 
-def _moved_to_platform2(project, _commit):
-  """Forbids commits to legacy repo in src/platform."""
-  return HookFailure('%s has been moved to platform2. This change should be '
-                     'made there.' % project)
-
-
 def _check_project_prefix(_project, commit):
   """Require the commit message have a project specific prefix as needed."""