MutableMessage    457 third_party/protobuf/src/google/protobuf/extension_set.cc MessageLite* ExtensionSet::MutableMessage(int number, FieldType type,
MutableMessage    138 third_party/protobuf/src/google/protobuf/extension_set_heavy.cc MessageLite* ExtensionSet::MutableMessage(const FieldDescriptor* descriptor,
MutableMessage    988 third_party/protobuf/src/google/protobuf/generated_message_reflection.cc Message* GeneratedMessageReflection::MutableMessage(