Standardize usage of virtual/override/final in extensions/

extensions/browser/api/bluetooth/bluetooth_private_apitest.cc

Index: extensions/browser/api/bluetooth/bluetooth_private_apitest.cc
diff --git a/extensions/browser/api/bluetooth/bluetooth_private_apitest.cc b/extensions/browser/api/bluetooth/bluetooth_private_apitest.cc
index af49ec9dbe1fa5cc0d92f65db6e738076c8fefa8..148715dadee9e79cb0d66949ad48ed6c6fa2cafd 100644
--- a/extensions/browser/api/bluetooth/bluetooth_private_apitest.cc
+++ b/extensions/browser/api/bluetooth/bluetooth_private_apitest.cc
@@ -46,7 +46,7 @@ class BluetoothPrivateApiTest : public ExtensionApiTest {
 
   virtual ~BluetoothPrivateApiTest() {}
 
-  virtual void SetUpOnMainThread() override {
+  void SetUpOnMainThread() override {
     CommandLine::ForCurrentProcess()->AppendSwitchASCII(
         switches::kWhitelistedExtensionID, kTestExtensionId);
     mock_adapter_ = new NiceMock<MockBluetoothAdapter>();
@@ -62,7 +62,7 @@ class BluetoothPrivateApiTest : public ExtensionApiTest {
     ON_CALL(*mock_adapter_.get(), IsPresent()).WillByDefault(Return(true));
   }
 
-  virtual void TearDownOnMainThread() override {}
+  void TearDownOnMainThread() override {}
 
   BluetoothEventRouter* event_router() {
     return BluetoothAPI::Get(browser()->profile())->event_router();