Move AccessorGenerator destructor to class declaration

PiperOrigin-RevId: 549417696

src/google/protobuf/compiler/rust/accessors/accessors.h

@@ -45,14 +45,13 @@ namespace rust {
 class AccessorGenerator {
  public:
   AccessorGenerator() = default;
+  virtual ~AccessorGenerator() = default;
 
   AccessorGenerator(const AccessorGenerator &) = delete;
   AccessorGenerator(AccessorGenerator &&) = delete;
   AccessorGenerator &operator=(const AccessorGenerator &) = delete;
   AccessorGenerator &operator=(AccessorGenerator &&) = delete;
 
-  virtual ~AccessorGenerator();
-
   // Constructs a generator for the given field.
   //
   // Returns `nullptr` if there is no known generator for this field.
@@ -93,8 +92,6 @@ class AccessorGenerator {
       Context<FieldDescriptor> field);
 };
 
-inline AccessorGenerator::~AccessorGenerator() = default;
-
 }  // namespace rust
 }  // namespace compiler
 }  // namespace protobuf