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

content/renderer/android/renderer_date_time_picker.h

Index: content/renderer/android/renderer_date_time_picker.h
diff --git a/content/renderer/android/renderer_date_time_picker.h b/content/renderer/android/renderer_date_time_picker.h
index 481d288c0552140e58f69876a9780f6841596457..970f93ba075da46a6c472e222cdc18f76d45f3b3 100644
--- a/content/renderer/android/renderer_date_time_picker.h
+++ b/content/renderer/android/renderer_date_time_picker.h
@@ -24,7 +24,7 @@ class RendererDateTimePicker : public RenderViewObserver {
       RenderViewImpl* sender,
       const blink::WebDateTimeChooserParams& params,
       blink::WebDateTimeChooserCompletion* completion);
-  virtual ~RendererDateTimePicker();
+  ~RendererDateTimePicker() override;
 
   bool Open();
 
@@ -33,7 +33,7 @@ class RendererDateTimePicker : public RenderViewObserver {
   void OnCancel();
 
   // RenderViewObserver
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   blink::WebDateTimeChooserParams chooser_params_;
   blink::WebDateTimeChooserCompletion* chooser_completion_;  // Not owned by us