Standardize usage of virtual/override/final in components/

components/proximity_auth/connection_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 "components/proximity_auth/connection.h"
 
 #include "components/proximity_auth/connection_observer.h"
 #include "components/proximity_auth/remote_device.h"
 #include "components/proximity_auth/wire_message.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 59 matching lines @@
                     bool success));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockConnectionObserver);
 };
 
 // Unlike WireMessage, offers a public constructor.
 class TestWireMessage : public WireMessage {
  public:
   TestWireMessage() : WireMessage(std::string(), std::string()) {}
-  virtual ~TestWireMessage() {}
+  ~TestWireMessage() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestWireMessage);
 };
 
 }  // namespace
 
 TEST(ProximityAuthConnectionTest, IsConnected) {
   StrictMock<MockConnection> connection;
   EXPECT_FALSE(connection.IsConnected());
@@ skipping 147 matching lines @@
   connection.AddObserver(&observer);
 
   ON_CALL(connection, DeserializeWireMessageProxy(_))
       .WillByDefault(DoAll(SetArgPointee<0>(false),
                            Return(static_cast<WireMessage*>(NULL))));
   EXPECT_CALL(observer, OnMessageReceived(_, _)).Times(0);
   connection.OnBytesReceived(std::string());
 }
 
 }  // namespace proximity_auth