[CleanUp] Remove parameter |by_user| in NotificationClosed

chrome/browser/notifications/platform_notification_service_unittest.cc

 // Copyright 2014 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.
 
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "chrome/browser/notifications/notification_test_util.h"
 #include "chrome/browser/notifications/platform_notification_service_impl.h"
 #include "chrome/test/base/testing_profile.h"
@@ skipping 10 matching lines @@
     : public content::DesktopNotificationDelegate {
  public:
   MockDesktopNotificationDelegate()
       : displayed_(false),
         clicked_(false) {}
 
   ~MockDesktopNotificationDelegate() override {}
 
   // content::DesktopNotificationDelegate implementation.
   void NotificationDisplayed() override { displayed_ = true; }
-  void NotificationClosed(bool by_user) override {}
+  void NotificationClosed() override {}
   void NotificationClick() override { clicked_ = true; }
 
   bool displayed() const { return displayed_; }
   bool clicked() const { return clicked_; }
 
  private:
   bool displayed_;
   bool clicked_;
 };
 
@@ skipping 202 matching lines @@
 
   service()->DisplayPersistentNotification(
       profile(), 42 /* sw_registration_id */, origin, SkBitmap(),
       content::PlatformNotificationData());
 
   base::Time after_persistent_notification =
       profile()->GetHostContentSettingsMap()->GetLastUsage(
           origin, origin, CONTENT_SETTINGS_TYPE_NOTIFICATIONS);
   EXPECT_GT(after_persistent_notification, after_page_notification);
 }