snapshot: Make destructors of interface classes public and virtual

snapshot/mac/system_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 16 matching lines @@
 
 class ProcessReader;
 
 namespace internal {
 
 //! \brief A SystemSnapshot of the running system, when the system runs Mac OS
 //!     X.
 class SystemSnapshotMac final : public SystemSnapshot {
  public:
   SystemSnapshotMac();
-  ~SystemSnapshotMac();
+  ~SystemSnapshotMac() override;
 
   //! \brief Initializes the object.
   //!
   //! \param[in] process_reader A reader for the process being snapshotted.
   //!     \n\n
   //!     It seems odd that a system snapshot implementation would need a
   //!     ProcessReader, but some of the information reported about the system
   //!     depends on the process it’s being reported for. For example, the
   //!     architecture returned by GetCPUArchitecture() should be the
   //!     architecture of the process, which may be different than the native
@@ skipping 44 matching lines @@
   bool os_server_;
   InitializationStateDcheck initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemSnapshotMac);
 };
 
 }  // namespace internal
 }  // namespace crashpad
 
 #endif  // CRASHPAD_SNAPSHOT_MAC_SYSTEM_SNAPSHOT_MAC_H_