Move Chrome terminating notification out of //apps

chrome/browser/extensions/extension_system_impl.h

Index: chrome/browser/extensions/extension_system_impl.h
diff --git a/chrome/browser/extensions/extension_system_impl.h b/chrome/browser/extensions/extension_system_impl.h
index 03a6c890a8b175a07277e481c72066c4696ed85f..fb8d8f1de28b5b141de3b4142c3c3833bd3065f6 100644
--- a/chrome/browser/extensions/extension_system_impl.h
+++ b/chrome/browser/extensions/extension_system_impl.h
@@ -9,6 +9,8 @@
 
 #include "base/macros.h"
 #include "build/build_config.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/one_shot_event.h"
 
@@ -78,7 +80,7 @@ class ExtensionSystemImpl : public ExtensionSystem {
 
   // Owns the Extension-related systems that have a single instance
   // shared between normal and incognito profiles.
-  class Shared : public KeyedService {
+  class Shared : public KeyedService, public content::NotificationObserver {
    public:
     explicit Shared(Profile* profile);
     ~Shared() override;
@@ -108,10 +110,16 @@ class ExtensionSystemImpl : public ExtensionSystem {
     ContentVerifier* content_verifier();
 
    private:
+    // content::NotificationObserver implementation.
+    void Observe(int type,
+                 const content::NotificationSource& source,
+                 const content::NotificationDetails& details) override;
+
     Profile* profile_;
 
     // The services that are shared between normal and incognito profiles.
 
+    content::NotificationRegistrar registrar_;
     std::unique_ptr<StateStore> state_store_;
     std::unique_ptr<StateStoreNotificationObserver>
         state_store_notification_observer_;