Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/blocked_content/popup_blocker_browsertest.cc

Index: chrome/browser/ui/blocked_content/popup_blocker_browsertest.cc
diff --git a/chrome/browser/ui/blocked_content/popup_blocker_browsertest.cc b/chrome/browser/ui/blocked_content/popup_blocker_browsertest.cc
index c7aa5b13042a5a0632e38df28ffcf0014d53698b..cf68e9c6a29178ad687d64af4b97677915dd79fe 100644
--- a/chrome/browser/ui/blocked_content/popup_blocker_browsertest.cc
+++ b/chrome/browser/ui/blocked_content/popup_blocker_browsertest.cc
@@ -92,7 +92,7 @@ class CloseObserver : public content::WebContentsObserver {
 class PopupBlockerBrowserTest : public InProcessBrowserTest {
  public:
   PopupBlockerBrowserTest() {}
-  virtual ~PopupBlockerBrowserTest() {}
+  ~PopupBlockerBrowserTest() override {}
 
   void SetUpOnMainThread() override {
     InProcessBrowserTest::SetUpOnMainThread();