snapshot: Make destructors of interface classes public and virtual

snapshot/module_snapshot.h

Index: snapshot/module_snapshot.h
diff --git a/snapshot/module_snapshot.h b/snapshot/module_snapshot.h
index b7e2770782ce128de5b5a988e5b3164cb2455438..ef2a9c1f0c485d8b6f9b8004fb7233f05662c4ca 100644
--- a/snapshot/module_snapshot.h
+++ b/snapshot/module_snapshot.h
@@ -30,6 +30,8 @@ namespace crashpad {
 //!     (binary image) loaded into a snapshot process.
 class ModuleSnapshot {
  public:
+  virtual ~ModuleSnapshot() {}
+
   //! \brief A module’s type.
   enum ModuleType {
     //! \brief The module’s type is unknown.
@@ -145,9 +147,6 @@ class ModuleSnapshot {
   //! The annotations returned by this method do not duplicate those returned by
   //! AnnotationsVector().
   virtual std::map<std::string, std::string> AnnotationsSimpleMap() const = 0;
-
- protected:
-  ~ModuleSnapshot() {}
 };
 
 }  // namespace crashpad