Open apps section on NTP when new app get installed

chrome/browser/dom_ui/shown_sections_handler.h

Index: chrome/browser/dom_ui/shown_sections_handler.h
diff --git a/chrome/browser/dom_ui/shown_sections_handler.h b/chrome/browser/dom_ui/shown_sections_handler.h
index e82c3fb7a105dd656f0178d9d8ef3b0dec635bce..ad227b4d46e592ce0b3fc4647cb088d56ce9858e 100644
--- a/chrome/browser/dom_ui/shown_sections_handler.h
+++ b/chrome/browser/dom_ui/shown_sections_handler.h
@@ -8,10 +8,10 @@
 
 #include "chrome/browser/dom_ui/dom_ui.h"
 #include "chrome/common/notification_observer.h"
-#include "chrome/common/notification_registrar.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 
 class DOMUI;
+class Extension;
 class Value;
 class PrefService;
 
@@ -63,10 +63,12 @@ class ShownSectionsHandler : public DOMMessageHandler,
                                int old_pref_version,
                                int new_pref_version);
 
+  static void OnExtensionInstalled(PrefService* prefs,
+                                   const Extension* extension);
+
  private:
   PrefService* pref_service_;
   PrefChangeRegistrar pref_registrar_;
-  NotificationRegistrar notification_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ShownSectionsHandler);
 };