Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/extension_disabled_ui_browsertest.cc

Index: chrome/browser/extensions/extension_disabled_ui_browsertest.cc
diff --git a/chrome/browser/extensions/extension_disabled_ui_browsertest.cc b/chrome/browser/extensions/extension_disabled_ui_browsertest.cc
index 9d4dca91a6e7bb254067ff112c7fa8f14727da4c..4fa5c92ff9426df037f153dfc430ee9de3e0e67c 100644
--- a/chrome/browser/extensions/extension_disabled_ui_browsertest.cc
+++ b/chrome/browser/extensions/extension_disabled_ui_browsertest.cc
@@ -34,13 +34,13 @@ using extensions::ExtensionPrefs;
 
 class ExtensionDisabledGlobalErrorTest : public ExtensionBrowserTest {
  protected:
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(CommandLine* command_line) override {
     ExtensionBrowserTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(switches::kAppsGalleryUpdateURL,
                                     "http://localhost/autoupdate/updates.xml");
   }
 
-  virtual void SetUpOnMainThread() override {
+  void SetUpOnMainThread() override {
     ExtensionBrowserTest::SetUpOnMainThread();
     EXPECT_TRUE(scoped_temp_dir_.CreateUniqueTempDir());
     service_ = extensions::ExtensionSystem::Get(