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

chrome/browser/plugins/plugin_infobar_delegates.h

Index: chrome/browser/plugins/plugin_infobar_delegates.h
diff --git a/chrome/browser/plugins/plugin_infobar_delegates.h b/chrome/browser/plugins/plugin_infobar_delegates.h
index 09bf110e39efebe162ad9baedc12db6585e7e0aa..d1034620e2c8b83432f9ff28de2e3e348c2af9cf 100644
--- a/chrome/browser/plugins/plugin_infobar_delegates.h
+++ b/chrome/browser/plugins/plugin_infobar_delegates.h
@@ -117,16 +117,16 @@ class PluginMetroModeInfoBarDelegate : public ConfirmInfoBarDelegate {
 
  private:
   PluginMetroModeInfoBarDelegate(Mode mode, const base::string16& name);
-  virtual ~PluginMetroModeInfoBarDelegate();
+  ~PluginMetroModeInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
-  virtual int GetIconID() const override;
-  virtual base::string16 GetMessageText() const override;
-  virtual int GetButtons() const override;
-  virtual base::string16 GetButtonLabel(InfoBarButton button) const override;
-  virtual bool Accept() override;
-  virtual base::string16 GetLinkText() const override;
-  virtual bool LinkClicked(WindowOpenDisposition disposition) override;
+  int GetIconID() const override;
+  base::string16 GetMessageText() const override;
+  int GetButtons() const override;
+  base::string16 GetButtonLabel(InfoBarButton button) const override;
+  bool Accept() override;
+  base::string16 GetLinkText() const override;
+  bool LinkClicked(WindowOpenDisposition disposition) override;
 
   const Mode mode_;
   const base::string16 name_;