Ensure media permission requests are correctly cancelled when permission prompts are ignored

chrome/browser/permissions/permission_manager.h

 // Copyright 2015 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_PERMISSIONS_PERMISSION_MANAGER_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_MANAGER_H_
 
 #include <unordered_map>
 
 #include "base/callback_forward.h"
@@ skipping 86 matching lines @@
       const base::Callback<void(blink::mojom::PermissionStatus)>& callback)
       override;
   void UnsubscribePermissionStatusChange(int subscription_id) override;
 
   // TODO(raymes): Rather than exposing this, use the denial reason from
   // GetPermissionStatus in callers to determine whether a permission is
   // denied due to the kill switch.
   bool IsPermissionKillSwitchOn(ContentSettingsType);
 
  private:
+  friend class PermissionManagerTest;
   friend class GeolocationPermissionContextTests;
 
   class PendingRequest;
   using PendingRequestsMap = IDMap<std::unique_ptr<PendingRequest>>;
 
+  class PermissionResponseCallback;
+
   struct Subscription;
   using SubscriptionsMap = IDMap<std::unique_ptr<Subscription>>;
 
   // KeyedService implementation
   void Shutdown() override;
 
   PermissionContextBase* GetPermissionContext(ContentSettingsType type);
 
   // Called when a permission was decided for a given PendingRequest. The
   // PendingRequest is identified by its |request_id| and the permission is
@@ skipping 25 matching lines @@
                      std::unique_ptr<PermissionContextBase>,
                      ContentSettingsTypeHash>
       permission_contexts_;
 
   base::WeakPtrFactory<PermissionManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionManager);
 };
 
 #endif // CHROME_BROWSER_PERMISSIONS_PERMISSION_MANAGER_H_