Standardize usage of virtual/override/final in content/

content/shell/browser/layout_test/layout_test_browser_main_parts.h

Index: content/shell/browser/layout_test/layout_test_browser_main_parts.h
diff --git a/content/shell/browser/layout_test/layout_test_browser_main_parts.h b/content/shell/browser/layout_test/layout_test_browser_main_parts.h
index c73f829eb97467e344989adc8345037c625de5a9..ef3f857d3756377ae2f1e5bfe9a910223beaa089 100644
--- a/content/shell/browser/layout_test/layout_test_browser_main_parts.h
+++ b/content/shell/browser/layout_test/layout_test_browser_main_parts.h
@@ -30,11 +30,11 @@ class ShellPluginServiceFilter;
 class LayoutTestBrowserMainParts : public ShellBrowserMainParts {
  public:
   explicit LayoutTestBrowserMainParts(const MainFunctionParams& parameters);
-  virtual ~LayoutTestBrowserMainParts();
+  ~LayoutTestBrowserMainParts() override;
 
  private:
-  virtual void InitializeBrowserContexts() override;
-  virtual void InitializeMessageLoopContext() override;
+  void InitializeBrowserContexts() override;
+  void InitializeMessageLoopContext() override;
 
 #if defined(ENABLE_PLUGINS)
   scoped_ptr<ShellPluginServiceFilter> plugin_service_filter_;