snapshot: Make destructors of interface classes public and virtual

snapshot/thread_snapshot.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,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef CRASHPAD_SNAPSHOT_THREAD_SNAPSHOT_H_
 #define CRASHPAD_SNAPSHOT_THREAD_SNAPSHOT_H_
 
 #include <stdint.h>
 
 namespace crashpad {
 
 struct CPUContext;
 class MemorySnapshot;
 
 //! \brief An abstract interface to a snapshot representing a thread
 //!     (lightweight process) present in a snapshot process.
 class ThreadSnapshot {
  public:
+  virtual ~ThreadSnapshot() {}
+
   //! \brief Returns a CPUContext object corresponding to the thread’s CPU
   //!     context.
   //!
   //! The caller does not take ownership of this object, it is scoped to the
   //! lifetime of the ThreadSnapshot object that it was obtained from.
   virtual const CPUContext* Context() const = 0;
 
   //! \brief Returns a MemorySnapshot object corresponding to the memory region
   //!     that contains the thread’s stack.
   //!
@@ skipping 13 matching lines @@
   virtual int SuspendCount() const = 0;
 
   //! \brief Returns the thread’s priority.
   //!
   //! Threads with higher priorities will have higher priority values.
   virtual int Priority() const = 0;
 
   //! \brief Returns the base address of a region used to store thread-specific
   //!     data.
   virtual uint64_t ThreadSpecificDataAddress() const = 0;
-
- protected:
-  ~ThreadSnapshot() {}
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_SNAPSHOT_THREAD_SNAPSHOT_H_