Standardize usage of virtual/override/final specifiers.

content/renderer/media/rtc_peer_connection_handler_unittest.cc

Index: content/renderer/media/rtc_peer_connection_handler_unittest.cc
diff --git a/content/renderer/media/rtc_peer_connection_handler_unittest.cc b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
index aac53423f2f6f18f49e56f429d9fbf7ca89daf41..247fcc129e1b32bde7d250ef6532ebeb2fb2871d 100644
--- a/content/renderer/media/rtc_peer_connection_handler_unittest.cc
+++ b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
@@ -199,7 +199,7 @@ class RTCPeerConnectionHandlerTest : public ::testing::Test {
     child_process_.reset(new ChildProcess());
   }
 
-  virtual void SetUp() {
+  void SetUp() override {
     mock_client_.reset(new NiceMock<MockWebRTCPeerConnectionHandlerClient>());
     mock_dependency_factory_.reset(new MockPeerConnectionDependencyFactory());
     pc_handler_.reset(
@@ -215,7 +215,7 @@ class RTCPeerConnectionHandlerTest : public ::testing::Test {
     ASSERT_TRUE(mock_peer_connection_);
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     pc_handler_.reset();
     mock_tracker_.reset();
     mock_dependency_factory_.reset();