Use exactly one of final, override, and virtual

util/mach/exc_client_variants_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 115 matching lines @@
       EXPECT_EQ(0u, *new_state_count);
       EXPECT_EQ(NULL, new_state);
     }
 
     return KERN_SUCCESS;
   }
 
  private:
   // MachMultiprocess:
 
-  virtual void MachMultiprocessParent() override {
+  void MachMultiprocessParent() override {
     kern_return_t kr = MachMessageServer::Run(this,
                                               LocalPort(),
                                               MACH_MSG_OPTION_NONE,
                                               MachMessageServer::kOneShot,
                                               MachMessageServer::kBlocking,
                                               0);
     EXPECT_EQ(KERN_SUCCESS, kr)
         << MachErrorMessage(kr, "MachMessageServer::Run");
 
     EXPECT_TRUE(handled_);
   }
 
-  virtual void MachMultiprocessChild() override {
+  void MachMultiprocessChild() override {
     const exception_type_t exception = exception_;
     const mach_exception_data_type_t code[] = {
         exception_code_,
         exception_subcode_
     };
 
     thread_t thread = THREAD_NULL;
     task_t task = TASK_NULL;
     if (all_fields_ || HasIdentity()) {
       thread = MachThreadSelf();
@@ skipping 121 matching lines @@
 
       TestExcClientVariants test_exc_client_variants(behavior, true);
       test_exc_client_variants.Run();
     }
   }
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad