Actually prevent sending notifications from apps.

chrome/browser/extensions/api/notification/notification_api.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_NOTIFICATION_NOTIFICATION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_NOTIFICATION_NOTIFICATION_API_H_
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/api/api_function.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/common/extensions/api/experimental_notification.h"
 
 #include <string>
 
 namespace extensions {
 
 class NotificationApiFunction : public ApiFunction {
  protected:
   NotificationApiFunction();
   virtual ~NotificationApiFunction();
 
   void CreateNotification(
       const std::string& id,
       api::experimental_notification::NotificationOptions* options);
+
+  bool IsNotificationApiEnabled();
+
+  // Called inside of RunImpl.
+  virtual bool RunNotificationApi() = 0;
+
+  // UITHreadExtensionFunction:
+  virtual bool RunImpl() OVERRIDE;
 };
 
 class NotificationCreateFunction : public NotificationApiFunction {
  public:
   NotificationCreateFunction();
 
   // UIThreadExtensionFunction:
-  virtual bool RunImpl() OVERRIDE;
+  virtual bool RunNotificationApi() OVERRIDE;
 
  protected:
   virtual ~NotificationCreateFunction();
 
  private:
   scoped_ptr<api::experimental_notification::Create::Params> params_;
 
   DECLARE_EXTENSION_FUNCTION("experimental.notification.create",
                              EXPERIMENTAL_NOTIFICATION_CREATE)
 };
 
 class NotificationUpdateFunction : public NotificationApiFunction {
  public:
   NotificationUpdateFunction();
 
   // UIThreadExtensionFunction:
-  virtual bool RunImpl() OVERRIDE;
+  virtual bool RunNotificationApi() OVERRIDE;
 
  protected:
   virtual ~NotificationUpdateFunction();
 
  private:
   scoped_ptr<api::experimental_notification::Update::Params> params_;
 
   DECLARE_EXTENSION_FUNCTION("experimental.notification.update",
                              EXPERIMENTAL_NOTIFICATION_UPDATE)
 };
 
 class NotificationDeleteFunction : public NotificationApiFunction {
  public:
   NotificationDeleteFunction();
 
   // UIThreadExtensionFunction:
-  virtual bool RunImpl() OVERRIDE;
+  virtual bool RunNotificationApi() OVERRIDE;
 
  protected:
   virtual ~NotificationDeleteFunction();
 
  private:
   scoped_ptr<api::experimental_notification::Delete::Params> params_;
 
   DECLARE_EXTENSION_FUNCTION("experimental.notification.delete",
                              EXPERIMENTAL_NOTIFICATION_DELETE)
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_NOTIFICATION_NOTIFICATION_API_H_