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

chrome/browser/browser_process_platform_part_aurawin.h

Index: chrome/browser/browser_process_platform_part_aurawin.h
diff --git a/chrome/browser/browser_process_platform_part_aurawin.h b/chrome/browser/browser_process_platform_part_aurawin.h
index 9cf6dc49927cc36902919ce409ad1178ec2f4cf3..8063f2693eef0c659f3c406ac8c413a0017263a7 100644
--- a/chrome/browser/browser_process_platform_part_aurawin.h
+++ b/chrome/browser/browser_process_platform_part_aurawin.h
@@ -17,19 +17,19 @@ class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase,
                                    public content::NotificationObserver {
  public:
   BrowserProcessPlatformPart();
-  virtual ~BrowserProcessPlatformPart();
+  ~BrowserProcessPlatformPart() override;
 
   // Invoked when the ASH metro viewer process on Windows 8 exits.
   void OnMetroViewerProcessTerminated();
 
   // Overridden from BrowserProcessPlatformPartBase:
-  virtual void PlatformSpecificCommandLineProcessing(
+  void PlatformSpecificCommandLineProcessing(
       const base::CommandLine& command_line) override;
 
   // content::NotificationObserver method:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
  private:
   // Hosts the channel for the Windows 8 metro viewer process which runs in