Standardize usage of virtual/override/final in components/

components/proximity_auth/connection_unittest.cc

Index: components/proximity_auth/connection_unittest.cc
diff --git a/components/proximity_auth/connection_unittest.cc b/components/proximity_auth/connection_unittest.cc
index e3c335f8124024f67189f0699f98f4221058862a..8fb15933760c5c6a85143097eb38c5caaba50177 100644
--- a/components/proximity_auth/connection_unittest.cc
+++ b/components/proximity_auth/connection_unittest.cc
@@ -77,7 +77,7 @@ class MockConnectionObserver : public ConnectionObserver {
 class TestWireMessage : public WireMessage {
  public:
   TestWireMessage() : WireMessage(std::string(), std::string()) {}
-  virtual ~TestWireMessage() {}
+  ~TestWireMessage() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestWireMessage);