Standardize usage of virtual/override/final specifiers.

content/public/test/browser_test_base.h

Index: content/public/test/browser_test_base.h
diff --git a/content/public/test/browser_test_base.h b/content/public/test/browser_test_base.h
index 5f7478def3d4c73a5cc8d3787145119b795f6f5f..e323d8878176f3b5e891173f2ede349b9477b780 100644
--- a/content/public/test/browser_test_base.h
+++ b/content/public/test/browser_test_base.h
@@ -29,7 +29,7 @@ namespace content {
 class BrowserTestBase : public testing::Test {
  public:
   BrowserTestBase();
-  virtual ~BrowserTestBase();
+  ~BrowserTestBase() override;
 
   // We do this so we can be used in a Task.
   void AddRef() {}
@@ -37,10 +37,10 @@ class BrowserTestBase : public testing::Test {
 
   // Configures everything for an in process browser test, then invokes
   // BrowserMain. BrowserMain ends up invoking RunTestOnMainThreadLoop.
-  virtual void SetUp() override;
+  void SetUp() override;
 
   // Restores state configured in SetUp.
-  virtual void TearDown() override;
+  void TearDown() override;
 
   // Override this to add any custom setup code that needs to be done on the
   // main thread after the browser is created and just before calling