snapshot: Make destructors of interface classes public and virtual

snapshot/mac/exception_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 19 matching lines @@
 
 class ProcessReader;
 
 namespace internal {
 
 //! \brief An ExceptionSnapshot of an exception sustained by a running (or
 //!     crashed) process on a Mac OS X system.
 class ExceptionSnapshotMac final : public ExceptionSnapshot {
  public:
   ExceptionSnapshotMac();
-  ~ExceptionSnapshotMac();
+  ~ExceptionSnapshotMac() override;
 
   //! \brief Initializes the object.
   //!
   //! Other than \a process_reader, the parameters may be passed directly
   //! through from a Mach exception handler.
   //!
   //! \param[in] process_reader A ProcessReader for the task that sustained the
   //!     exception.
   //!
   //! \return `true` if the snapshot could be created, `false` otherwise with
@@ skipping 31 matching lines @@
   uint32_t exception_code_0_;
   InitializationStateDcheck initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(ExceptionSnapshotMac);
 };
 
 }  // namespace internal
 }  // namespace crashpad
 
 #endif  // CRASHPAD_SNAPSHOT_MAC_EXCEPTION_SNAPSHOT_MAC_H_