Standardize usage of virtual/override/final specifiers.

remoting/base/auto_thread_unittest.cc

Index: remoting/base/auto_thread_unittest.cc
diff --git a/remoting/base/auto_thread_unittest.cc b/remoting/base/auto_thread_unittest.cc
index 1e14cfaebc0d39cf3063b05aac73a6ebadae010b..365f2e2e25b71c22d49d7987628daee13080c3b8 100644
--- a/remoting/base/auto_thread_unittest.cc
+++ b/remoting/base/auto_thread_unittest.cc
@@ -72,14 +72,14 @@ class AutoThreadTest : public testing::Test {
     message_loop_.Run();
   }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     main_task_runner_ = new AutoThreadTaskRunner(
         message_loop_.message_loop_proxy(),
         base::Bind(&AutoThreadTest::QuitMainMessageLoop,
                    base::Unretained(this)));
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     // Verify that |message_loop_| was quit by the AutoThreadTaskRunner.
     EXPECT_TRUE(message_loop_quit_correctly_);
   }