revert 'Optimize data size estimation for proto coder.' (#37710)

Author: stankiewicz

sdks/python/apache_beam/coders/coder_impl.py

@@ -316,9 +316,6 @@ def decode(self, encoded):
     proto_message.ParseFromString(encoded)  # This is in effect "ParsePartial".
     return proto_message
 
-  def estimate_size(self, value, nested=False):
-    return self._get_nested_size(value.ByteSize(), nested)
-
 
 class DeterministicProtoCoderImpl(ProtoCoderImpl):
   """For internal use only; no backwards-compatibility guarantees."""
@@ -338,9 +335,6 @@ def encode(self, value):
   def decode(self, value):
     return self.proto_plus_type.deserialize(value)
 
-  def estimate_size(self, value, nested=False):
-    return self._get_nested_size(type(value).pb(value).ByteSize(), nested)
-
 
 UNKNOWN_TYPE = 0xFF
 NONE_TYPE = 0