Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/power/process_power_collector_unittest.cc

Index: chrome/browser/power/process_power_collector_unittest.cc
diff --git a/chrome/browser/power/process_power_collector_unittest.cc b/chrome/browser/power/process_power_collector_unittest.cc
index 443ac69e3b16802f59704e0ccfea30209a6dd847..9a93cf33bc523e4f335685d700d953e7c2bf7b60 100644
--- a/chrome/browser/power/process_power_collector_unittest.cc
+++ b/chrome/browser/power/process_power_collector_unittest.cc
@@ -95,14 +95,13 @@ class TestAppWindowContents : public extensions::AppWindowContents {
       : web_contents_(web_contents) {}
 
   // apps:AppWindowContents
-  virtual void Initialize(content::BrowserContext* context,
-                          const GURL& url) override {}
-  virtual void LoadContents(int32 creator_process_id) override {}
-  virtual void NativeWindowChanged(
+  void Initialize(content::BrowserContext* context, const GURL& url) override {}
+  void LoadContents(int32 creator_process_id) override {}
+  void NativeWindowChanged(
       extensions::NativeAppWindow* native_app_window) override {}
-  virtual void NativeWindowClosed() override {}
-  virtual void DispatchWindowShownForTests() const override {}
-  virtual content::WebContents* GetWebContents() const override {
+  void NativeWindowClosed() override {}
+  void DispatchWindowShownForTests() const override {}
+  content::WebContents* GetWebContents() const override {
     return web_contents_.get();
   }