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

ppapi/tests/test_flash_fullscreen_for_browser_ui.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.
 
 #ifndef PPAPI_TESTS_TEST_FLASH_FULLSCREEN_FOR_BROWSER_UI_H_
 #define PPAPI_TESTS_TEST_FLASH_FULLSCREEN_FOR_BROWSER_UI_H_
 
 #include <string>
 
 #include "ppapi/cpp/compositor.h"
@@ skipping 11 matching lines @@
 // chrome/browser/ui/exclusive_access/
 //      flash_fullscreen_interactive_browsertest.cc.
 //
 // At start, this simulated Flash plugin will enter fullscreen and paint a green
 // color fill.  From there, it will respond to mouse clicks or key presses by
 // toggling its fill color between red and blue.  The browser test reads these
 // color changes to detect the desired behavior.
 class TestFlashFullscreenForBrowserUI : public TestCase {
  public:
   explicit TestFlashFullscreenForBrowserUI(TestingInstance* instance);
-  virtual ~TestFlashFullscreenForBrowserUI();
+  ~TestFlashFullscreenForBrowserUI() override;
 
   // TestCase implementation.
-  virtual bool Init() override;
-  virtual void RunTests(const std::string& filter) override;
-  virtual void DidChangeView(const pp::View& view) override;
-  virtual bool HandleInputEvent(const pp::InputEvent& event) override;
+  bool Init() override;
+  void RunTests(const std::string& filter) override;
+  void DidChangeView(const pp::View& view) override;
+  bool HandleInputEvent(const pp::InputEvent& event) override;
 
  private:
   std::string TestEnterFullscreen();
   void Paint(int32_t last_compositor_result);
 
   pp::FlashFullscreen screen_mode_;
   NestedEvent view_change_event_;
 
   pp::Compositor compositor_;
   pp::Size layer_size_;
   pp::CompositorLayer color_layer_;
 
   int num_trigger_events_;
 
   pp::CompletionCallbackFactory<TestFlashFullscreenForBrowserUI>
       callback_factory_;
 };
 
 #endif  // PPAPI_TESTS_TEST_FLASH_FULLSCREEN_FOR_BROWSER_UI_H_