[Do not commit] Track revocations in content_settings::Observer

chrome/browser/push_messaging/push_messaging_service_impl.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 "chrome/browser/push_messaging/push_messaging_service_impl.h"
 
 #include <vector>
 
 #include "base/barrier_closure.h"
 #include "base/bind.h"
@@ skipping 634 matching lines @@
       break;
   }
 }
 
 // OnContentSettingChanged methods ---------------------------------------------
 
 void PushMessagingServiceImpl::OnContentSettingChanged(
     const ContentSettingsPattern& primary_pattern,
     const ContentSettingsPattern& secondary_pattern,
     ContentSettingsType content_type,
+    ContentSetting previous_value,
     std::string resource_identifier) {
   if (content_type != CONTENT_SETTINGS_TYPE_PUSH_MESSAGING &&
       content_type != CONTENT_SETTINGS_TYPE_NOTIFICATIONS) {
     return;
   }
 
   std::vector<PushMessagingAppIdentifier> all_app_identifiers =
       PushMessagingAppIdentifier::GetAll(profile_);
 
   base::Closure barrier_closure = base::BarrierClosure(
@@ skipping 89 matching lines @@
          blink::WebPushPermissionStatusGranted;
 }
 
 gcm::GCMDriver* PushMessagingServiceImpl::GetGCMDriver() const {
   gcm::GCMProfileService* gcm_profile_service =
       gcm::GCMProfileServiceFactory::GetForProfile(profile_);
   CHECK(gcm_profile_service);
   CHECK(gcm_profile_service->driver());
   return gcm_profile_service->driver();
 }