Standardize usage of virtual/override/final specifiers.

extensions/browser/guest_view/web_view/web_view_apitest.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/values.h"
 #include "extensions/browser/guest_view/test_guest_view_manager.h"
 #include "extensions/shell/test/shell_test.h"
 #include "ui/gfx/switches.h"
 
 namespace content {
@@ skipping 23 matching lines @@
 
   // Returns the GuestViewManager singleton.
   TestGuestViewManager* GetGuestViewManager();
 
   content::WebContents* GetGuestWebContents();
   void SendMessageToGuestAndWait(const std::string& message,
                                  const std::string& wait_message);
   void SendMessageToEmbedder(const std::string& message);
 
   // content::BrowserTestBase implementation.
-  virtual void RunTestOnMainThreadLoop() override;
-  virtual void SetUpCommandLine(base::CommandLine* command_line) override;
-  virtual void SetUpOnMainThread() override;
-  virtual void TearDownOnMainThread() override;
+  void RunTestOnMainThreadLoop() override;
+  void SetUpCommandLine(base::CommandLine* command_line) override;
+  void SetUpOnMainThread() override;
+  void TearDownOnMainThread() override;
 
   content::WebContents* embedder_web_contents_;
   TestGuestViewManagerFactory factory_;
   base::DictionaryValue test_config_;
 
  private:
   content::WebContents* GetFirstAppWindowWebContents();
 };
 
 class WebViewDPIAPITest : public WebViewAPITest {
  protected:
-  virtual void SetUp() override;
+  void SetUp() override;
   static float scale() { return 2.0f; }
 };
 
 }  // namespace extensions