snapshot: Make destructors of interface classes public and virtual

snapshot/mac/process_snapshot_mac.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 25 matching lines @@
 #include "util/misc/initialization_state_dcheck.h"
 #include "util/stdlib/pointer_container.h"
 
 namespace crashpad {
 
 //! \brief A ProcessSnapshot of a running (or crashed) process running on a Mac
 //!     OS X system.
 class ProcessSnapshotMac final : public ProcessSnapshot {
  public:
   ProcessSnapshotMac();
-  ~ProcessSnapshotMac();
+  ~ProcessSnapshotMac() override;
 
   //! \brief Initializes the object.
   //!
   //! \param[in] task The task to create a snapshot from.
   //!
   //! \return `true` if the snapshot could be created, `false` otherwise with
   //!     an appropriate message logged.
   bool Initialize(task_t task);
 
   //! \brief Initializes the object’s exception.
@@ skipping 41 matching lines @@
   ProcessReader process_reader_;
   timeval snapshot_time_;
   InitializationStateDcheck initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessSnapshotMac);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_SNAPSHOT_MAC_PROCESS_SNAPSHOT_MAC_H_