1 files changed, 0 insertions, 26 deletions
diff --git a/python/google/protobuf/internal/api_implementation.py b/python/google/protobuf/internal/api_implementation.py
index ab9e7812..23cc2c0a 100755
--- a/python/google/protobuf/internal/api_implementation.py
+++ b/python/google/protobuf/internal/api_implementation.py
@@ -145,29 +145,3 @@ def Version():
 # For internal use only
 def IsPythonDefaultSerializationDeterministic():
   return _python_deterministic_proto_serialization
-
-# DO NOT USE: For migration and testing only. Will be removed when Proto3
-# defaults to preserve unknowns.
-if _implementation_type == 'cpp':
-  try:
-    # pylint: disable=g-import-not-at-top
-    from google.protobuf.pyext import _message
-
-    def GetPythonProto3PreserveUnknownsDefault():
-      return _message.GetPythonProto3PreserveUnknownsDefault()
-
-    def SetPythonProto3PreserveUnknownsDefault(preserve):
-      _message.SetPythonProto3PreserveUnknownsDefault(preserve)
-  except ImportError:
-    # Unrecognized cpp implementation. Skipping the unknown fields APIs.
-    pass
-else:
-  _python_proto3_preserve_unknowns_default = True
-
-  def GetPythonProto3PreserveUnknownsDefault():
-    return _python_proto3_preserve_unknowns_default
-
-  def SetPythonProto3PreserveUnknownsDefault(preserve):
-    global _python_proto3_preserve_unknowns_default
-    _python_proto3_preserve_unknowns_default = preserve
-