Standardize usage of virtual/override/final specifiers.

chrome/browser/external_protocol/external_protocol_handler_unittest.cc

Index: chrome/browser/external_protocol/external_protocol_handler_unittest.cc
diff --git a/chrome/browser/external_protocol/external_protocol_handler_unittest.cc b/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
index 4518b75e4cc994ddc859f2e6c819f9478b230640..1aac925915287ac0527a9c2e69d0c17390f8c694 100644
--- a/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
+++ b/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
@@ -103,11 +103,9 @@ class ExternalProtocolHandlerTest : public testing::Test {
       : ui_thread_(BrowserThread::UI, base::MessageLoop::current()),
         file_thread_(BrowserThread::FILE) {}
 
-  virtual void SetUp() {
-    file_thread_.Start();
-  }
+  void SetUp() override { file_thread_.Start(); }
 
-  virtual void TearDown() {
+  void TearDown() override {
     // Ensure that g_accept_requests gets set back to true after test execution.
     ExternalProtocolHandler::PermitLaunchUrl();
   }