Removed unused OneofMutEnumRsName function

PiperOrigin-RevId: 616858530

src/google/protobuf/compiler/rust/naming.cc

@@ -316,10 +316,6 @@ std::string OneofViewEnumRsName(const OneofDescriptor& oneof) {
   return RsSafeName(SnakeToUpperCamelCase(oneof.name()));
 }
 
-std::string OneofMutEnumRsName(const OneofDescriptor& oneof) {
-  return SnakeToUpperCamelCase(oneof.name()) + "Mut";
-}
-
 std::string OneofCaseEnumRsName(const OneofDescriptor& oneof) {
   // Note: This is the name used for the cpp Case enum, we use it for both
   // the Rust Case enum as well as for the cpp case enum in the cpp thunk.

src/google/protobuf/compiler/rust/naming.h

@@ -50,7 +50,6 @@ std::string EnumRsName(const EnumDescriptor& desc);
 std::string EnumValueRsName(const EnumValueDescriptor& value);
 
 std::string OneofViewEnumRsName(const OneofDescriptor& oneof);
-std::string OneofMutEnumRsName(const OneofDescriptor& oneof);
 std::string OneofCaseEnumRsName(const OneofDescriptor& oneof);
 std::string OneofCaseRsName(const FieldDescriptor& oneof_field);