Standardize usage of virtual/override/final specifiers.

content/browser/manifest/manifest_browsertest.cc

 // 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/command_line.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/manifest.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/public/test/test_navigation_observer.h"
 #include "content/shell/browser/shell.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 namespace content {
 
 class ManifestBrowserTest : public ContentBrowserTest  {
  protected:
   ManifestBrowserTest() {}
-  virtual ~ManifestBrowserTest() {}
+  ~ManifestBrowserTest() override {}
 
   void GetManifestAndWait() {
     shell()->web_contents()->GetManifest(
         base::Bind(&ManifestBrowserTest::OnGetManifest,
                    base::Unretained(this)));
 
     message_loop_runner_ = new MessageLoopRunner();
     message_loop_runner_->Run();
   }
 
@@ skipping 161 matching lines @@
   std::string manifest_url =
       https_server->GetURL("/manifest/dummy-manifest.json").spec();
   ASSERT_TRUE(content::ExecuteScript(shell()->web_contents(),
                                      "setManifestTo('" + manifest_url + "')"));
 
   GetManifestAndWait();
   EXPECT_TRUE(manifest().IsEmpty());
 }
 
 } // namespace content