Restore logic to unsubscribe from permission changes on frame change.

content/browser/permissions/permission_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 "content/browser/permissions/permission_service_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 239 matching lines @@
     PermissionDescriptorPtr permission,
     const url::Origin& origin,
     PermissionStatus last_known_status,
     PermissionObserverPtr observer) {
   PermissionStatus current_status = GetPermissionStatus(permission, origin);
   if (current_status != last_known_status) {
     observer->OnPermissionStatusChange(current_status);
     last_known_status = current_status;
   }
 
-  BrowserContext* browser_context = context_->GetBrowserContext();
-  DCHECK(browser_context);
-  if (!browser_context->GetPermissionManager())
-    return;
-
   context_->CreateSubscription(PermissionDescriptorToPermissionType(permission),
                                origin, std::move(observer));
 }
 
 PermissionStatus PermissionServiceImpl::GetPermissionStatus(
     const PermissionDescriptorPtr& permission,
     const url::Origin& origin) {
   return GetPermissionStatusFromType(
       PermissionDescriptorToPermissionType(permission), origin);
 }
@@ skipping 23 matching lines @@
 
   GURL requesting_origin(origin.Serialize());
   // If the embedding_origin is empty we'll use |origin| instead.
   GURL embedding_origin = context_->GetEmbeddingOrigin();
   browser_context->GetPermissionManager()->ResetPermission(
       type, requesting_origin,
       embedding_origin.is_empty() ? requesting_origin : embedding_origin);
 }
 
 }  // namespace content