Standardize usage of virtual/override/final in components/

components/proximity_auth/bluetooth_connection_unittest.cc

Index: components/proximity_auth/bluetooth_connection_unittest.cc
diff --git a/components/proximity_auth/bluetooth_connection_unittest.cc b/components/proximity_auth/bluetooth_connection_unittest.cc
index 14765335d5a933bcf207f5ff3258190728994e4d..a30d08c5e800573de5e1f1d51c0315282d3ab559 100644
--- a/components/proximity_auth/bluetooth_connection_unittest.cc
+++ b/components/proximity_auth/bluetooth_connection_unittest.cc
@@ -80,9 +80,9 @@ class MockBluetoothConnection : public BluetoothConnection {
 class TestWireMessage : public WireMessage {
  public:
   TestWireMessage() : WireMessage("permit id", "payload") {}
-  virtual ~TestWireMessage() {}
+  ~TestWireMessage() override {}
 
-  virtual std::string Serialize() const override { return kSerializedMessage; }
+  std::string Serialize() const override { return kSerializedMessage; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestWireMessage);