Standardize usage of virtual/override/final specifiers in base/.

base/message_loop/message_pump_glib_unittest.cc

Index: base/message_loop/message_pump_glib_unittest.cc
diff --git a/base/message_loop/message_pump_glib_unittest.cc b/base/message_loop/message_pump_glib_unittest.cc
index ae4fefe2e7568631b779fbc8ceab9bfc72ad73f6..7ddd4f08a0426922d4a77ec60032cc58f7b32239 100644
--- a/base/message_loop/message_pump_glib_unittest.cc
+++ b/base/message_loop/message_pump_glib_unittest.cc
@@ -161,11 +161,11 @@ class MessagePumpGLibTest : public testing::Test {
   MessagePumpGLibTest() : loop_(NULL), injector_(NULL) { }
 
   // Overridden from testing::Test:
-  virtual void SetUp() override {
+  void SetUp() override {
     loop_ = new MessageLoop(MessageLoop::TYPE_UI);
     injector_ = new EventInjector();
   }
-  virtual void TearDown() override {
+  void TearDown() override {
     delete injector_;
     injector_ = NULL;
     delete loop_;