Standardize usage of virtual/override/final in mojo/

mojo/public/cpp/application/tests/service_registry_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/application/lib/service_registry.h"
 
 #include "mojo/public/cpp/application/lib/service_connector.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace internal {
 namespace {
 
 class TestConnector : public ServiceConnectorBase {
  public:
   TestConnector(const std::string& name, int* delete_count)
       : ServiceConnectorBase(name), delete_count_(delete_count) {}
-  virtual ~TestConnector() { (*delete_count_)++; }
-  virtual void ConnectToService(
-      const std::string& name,
-      ScopedMessagePipeHandle client_handle) override {}
+  ~TestConnector() override { (*delete_count_)++; }
+  void ConnectToService(const std::string& name,
+                        ScopedMessagePipeHandle client_handle) override {}
 
  private:
   int* delete_count_;
 };
 
 TEST(ServiceRegistryTest, Ownership) {
   int delete_count = 0;
 
   // Destruction.
   {
@@ skipping 25 matching lines @@
     registry.AddServiceConnector(new TestConnector("TC1", &delete_count));
     registry.AddServiceConnector(new TestConnector("TC1", &delete_count));
     EXPECT_EQ(5, delete_count);
   }
   EXPECT_EQ(6, delete_count);
 }
 
 }  // namespace
 }  // namespace internal
 }  // namespace mojo