Use exactly one of final, override, and virtual

util/mach/exc_server_variants_test.cc

Index: util/mach/exc_server_variants_test.cc
diff --git a/util/mach/exc_server_variants_test.cc b/util/mach/exc_server_variants_test.cc
index bdb7e47ab587382fce49d2724cb2818074ce5aaf..73f463781ea6066da5088238ff77e3d1720cd819 100644
--- a/util/mach/exc_server_variants_test.cc
+++ b/util/mach/exc_server_variants_test.cc
@@ -939,7 +939,7 @@ class TestExcServerVariants : public UniversalMachExcServer,
  private:
   // MachMultiprocess:
 
-  virtual void MachMultiprocessParent() override {
+  void MachMultiprocessParent() override {
     kern_return_t kr = MachMessageServer::Run(this,
                                               LocalPort(),
                                               MACH_MSG_OPTION_NONE,
@@ -952,7 +952,7 @@ class TestExcServerVariants : public UniversalMachExcServer,
     EXPECT_TRUE(handled_);
   }
 
-  virtual void MachMultiprocessChild() override {
+  void MachMultiprocessChild() override {
     // Set the parent as the exception handler for EXC_CRASH.
     kern_return_t kr = task_set_exception_ports(
         mach_task_self(), EXC_MASK_CRASH, RemotePort(), behavior_, flavor_);