Remove last usage functions from HostContentSettingsMap and clean up prefs

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 <stdint.h>
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 273 matching lines @@
   EXPECT_TRUE(notification.silent());
 
   const auto& buttons = notification.buttons();
   ASSERT_EQ(2u, buttons.size());
   EXPECT_EQ("Button 1", base::UTF16ToUTF8(buttons[0].title));
   EXPECT_EQ(message_center::ButtonType::BUTTON, buttons[0].type);
   EXPECT_EQ("Button 2", base::UTF16ToUTF8(buttons[1].title));
   EXPECT_EQ(message_center::ButtonType::TEXT, buttons[1].type);
 }
 
-TEST_F(PlatformNotificationServiceTest, NotificationPermissionLastUsage) {
-  // Both page and persistent notifications should update the last usage
-  // time of the notification permission for the origin.
-  GURL origin("https://chrome.com/");
-  base::Time begin_time;
-
-  CreateSimplePageNotification();
-
-  base::Time after_page_notification =
-      HostContentSettingsMapFactory::GetForProfile(profile())->GetLastUsage(
-          origin, origin, CONTENT_SETTINGS_TYPE_NOTIFICATIONS);
-  EXPECT_GT(after_page_notification, begin_time);
-
-  // Ensure that there is at least some time between the two calls.
-  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(1));
-
-  service()->DisplayPersistentNotification(
-      profile(), kNotificationId, GURL() /* service_worker_scope */, origin,
-      PlatformNotificationData(), NotificationResources());
-
-  base::Time after_persistent_notification =
-      HostContentSettingsMapFactory::GetForProfile(profile())->GetLastUsage(
-          origin, origin, CONTENT_SETTINGS_TYPE_NOTIFICATIONS);
-  EXPECT_GT(after_persistent_notification, after_page_notification);
-}
-
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 
 TEST_F(PlatformNotificationServiceTest, DisplayNameForContextMessage) {
   base::string16 display_name = service()->DisplayNameForContextMessage(
       profile(), GURL("https://chrome.com/"));
 
   EXPECT_TRUE(display_name.empty());
 
   // Create a mocked extension.
   scoped_refptr<extensions::Extension> extension =
@@ skipping 106 matching lines @@
       profile(),
       GURL() /* service_worker_scope */,
       GURL("chrome-extension://honijodknafkokifofgiaalefdiedpko/main.html"),
       notification_data, NotificationResources(),
       new MockNotificationDelegate("hello"));
   EXPECT_EQ("NotificationTest",
             base::UTF16ToUTF8(notification.context_message()));
 }
 
 #endif  // BUILDFLAG(ENABLE_EXTENSIONS)