Remove API owners check from presubmit script

This is now enforced using OWNERS

Change-Id: Iee0c639731376d7bc4c3deaa65ccadef3fae53f4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/445642
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

PRESUBMIT.py

@@ -18,20 +18,6 @@ import sys
 import traceback
 
 
-REVERT_CL_SUBJECT_PREFIX = 'Revert '
-
-# Please add the complete email address here (and not just 'xyz@' or 'xyz').
-PUBLIC_API_OWNERS = (
-    'brianosman@google.com',
-    'bsalomon@google.com',
-    'djsollen@chromium.org',
-    'djsollen@google.com',
-    'hcm@chromium.org',
-    'hcm@google.com',
-    'reed@chromium.org',
-    'reed@google.com',
-)
-
 AUTHORS_FILE_NAME = 'AUTHORS'
 RELEASE_NOTES_FILE_NAME = 'RELEASE_NOTES.txt'
 
@@ -404,75 +390,6 @@ def _CheckReleaseNotesForPublicAPI(input_api, output_api):
   return results
 
 
-
-def _CheckLGTMsForPublicAPI(input_api, output_api):
-  """Check LGTMs for public API changes.
-
-  For public API files make sure there is an LGTM from the list of owners in
-  PUBLIC_API_OWNERS.
-  """
-  results = []
-  requires_owner_check = False
-  for affected_file in input_api.AffectedFiles():
-    affected_file_path = affected_file.LocalPath()
-    file_path, file_ext = os.path.splitext(affected_file_path)
-    # We only care about files that end in .h and are under the top-level
-    # include dir, but not include/private.
-    if (file_ext == '.h' and
-        'include' == file_path.split(os.path.sep)[0] and
-        'private' not in file_path):
-      requires_owner_check = True
-
-  if not requires_owner_check:
-    return results
-
-  lgtm_from_owner = False
-  if input_api.change.issue:
-    cr = CodeReview(input_api)
-
-    if re.match(REVERT_CL_SUBJECT_PREFIX, cr.GetSubject(), re.I):
-      # It is a revert CL, ignore the public api owners check.
-      return results
-
-    if input_api.gerrit:
-      for reviewer in cr.GetReviewers():
-        if reviewer in PUBLIC_API_OWNERS:
-          # If an owner is specified as an reviewer in Gerrit then ignore the
-          # public api owners check.
-          return results
-    else:
-      match = re.search(r'^TBR=(.*)$', cr.GetDescription(), re.M)
-      if match:
-        tbr_section = match.group(1).strip().split(' ')[0]
-        tbr_entries = tbr_section.split(',')
-        for owner in PUBLIC_API_OWNERS:
-          if owner in tbr_entries or owner.split('@')[0] in tbr_entries:
-            # If an owner is specified in the TBR= line then ignore the public
-            # api owners check.
-            return results
-
-    if cr.GetOwnerEmail() in PUBLIC_API_OWNERS:
-      # An owner created the CL that is an automatic LGTM.
-      lgtm_from_owner = True
-
-    for approver in cr.GetApprovers():
-      if approver in PUBLIC_API_OWNERS:
-        # Found an lgtm in a message from an owner.
-        lgtm_from_owner = True
-        break
-
-  if not lgtm_from_owner:
-    results.append(
-        output_api.PresubmitError(
-            "If this CL adds to or changes Skia's public API, you need an LGTM "
-            "from any of %s.  If this CL only removes from or doesn't change "
-            "Skia's public API, please add a short note to the CL saying so. "
-            "Add one of the owners as a reviewer to your CL as well as to the "
-            "TBR= line.  If you don't know if this CL affects Skia's public "
-            "API, treat it like it does." % str(PUBLIC_API_OWNERS)))
-  return results
-
-
 def PostUploadHook(gerrit, change, output_api):
   """git cl upload will call this hook after the issue is created/modified.
 
@@ -528,7 +445,6 @@ def CheckChangeOnCommit(input_api, output_api):
   """Presubmit checks for the change on commit."""
   results = []
   results.extend(_CommonChecks(input_api, output_api))
-  results.extend(_CheckLGTMsForPublicAPI(input_api, output_api))
   results.extend(_CheckOwnerIsInAuthorsFile(input_api, output_api))
   # Checks for the presence of 'DO NOT''SUBMIT' in CL description and in
   # content of files.