Rewrite most of the scopers in //base/mac to use ScopedTypeRef or ScopedGeneric.

base/mac/scoped_ioplugininterface.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MAC_SCOPED_IOPLUGININTERFACE_H_
 #define BASE_MAC_SCOPED_IOPLUGININTERFACE_H_
 
 #include <IOKit/IOKitLib.h>
 
-#include "base/compiler_specific.h"
-#include "base/macros.h"
+#include "base/mac/scoped_typeref.h"
 
 namespace base {
 namespace mac {
 
+namespace internal {
+
+template <typename T>
+struct ScopedIOPluginInterfaceTraits {
+  static T InvalidValue() { return nullptr; }
+  static T Retain(T t) {
+    (*t)->AddRef(t);
+    return t;
+  }
+  static void Release(T t) { (*t)->Release(t); }
+};
+
+}  // namespace internal
+
 // Just like ScopedCFTypeRef but for IOCFPlugInInterface and friends
 // (IOUSBInterfaceStruct and IOUSBDeviceStruct320 in particular).
-template<typename T>
-class ScopedIOPluginInterface {
- public:
-  typedef T** InterfaceT;
-  typedef InterfaceT element_type;
-
-  explicit ScopedIOPluginInterface(InterfaceT object = NULL)
-      : object_(object) {
-  }
-
-  ~ScopedIOPluginInterface() {
-    if (object_)
-      (*object_)->Release(object_);
-  }
-
-  void reset(InterfaceT object = NULL) {
-    if (object_)
-      (*object_)->Release(object_);
-    object_ = object;
-  }
-
-  bool operator==(InterfaceT that) const {
-    return object_ == that;
-  }
-
-  bool operator!=(InterfaceT that) const {
-    return object_ != that;
-  }
-
-  operator InterfaceT() const {
-    return object_;
-  }
-
-  InterfaceT get() const {
-    return object_;
-  }
-
-  void swap(ScopedIOPluginInterface& that) {
-    InterfaceT temp = that.object_;
-    that.object_ = object_;
-    object_ = temp;
-  }
-
-  InterfaceT release() WARN_UNUSED_RESULT {
-    InterfaceT temp = object_;
-    object_ = NULL;
-    return temp;
-  }
-
- private:
-  InterfaceT object_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedIOPluginInterface);
-};
+template <typename T>
+using ScopedIOPluginInterface =
+    ScopedTypeRef<T**, internal::ScopedIOPluginInterfaceTraits<T**>>;
 
 }  // namespace mac
 }  // namespace base
 
 #endif  // BASE_MAC_SCOPED_IOPLUGININTERFACE_H_