Update {virtual,override} to follow C++11 style in components.

components/test/run_all_unittests.cc

 // Copyright (c) 2012 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/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/path_service.h"
 #include "base/test/launcher/unit_test_launcher.h"
@@ skipping 70 matching lines @@
 
     base::TestSuite::Shutdown();
   }
 
   DISALLOW_COPY_AND_ASSIGN(ComponentsTestSuite);
 };
 
 class ComponentsUnitTestEventListener : public testing::EmptyTestEventListener {
  public:
   ComponentsUnitTestEventListener() {}
-  virtual ~ComponentsUnitTestEventListener() {}
+  ~ComponentsUnitTestEventListener() override {}
 
-  virtual void OnTestStart(const testing::TestInfo& test_info) override {
+  void OnTestStart(const testing::TestInfo& test_info) override {
     content_initializer_.reset(new content::TestContentClientInitializer());
   }
 
-  virtual void OnTestEnd(const testing::TestInfo& test_info) override {
+  void OnTestEnd(const testing::TestInfo& test_info) override {
     content_initializer_.reset();
   }
 
  private:
   scoped_ptr<content::TestContentClientInitializer> content_initializer_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentsUnitTestEventListener);
 };
 
 }  // namespace
 
 int main(int argc, char** argv) {
   ComponentsTestSuite test_suite(argc, argv);
 
   // The listener will set up common test environment for all components unit
   // tests.
   testing::TestEventListeners& listeners =
       testing::UnitTest::GetInstance()->listeners();
   listeners.Append(new ComponentsUnitTestEventListener());
 
   return base::LaunchUnitTests(
       argc, argv, base::Bind(&base::TestSuite::Run,
                              base::Unretained(&test_suite)));
 }