Applied the IconType.

base/callback_old.h

 // Copyright (c) 2010 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_CALLBACK_OLD_H_
 #define BASE_CALLBACK_OLD_H_
 #pragma once
 
 #include "base/tuple.h"
 #include "base/raw_scoped_refptr_mismatch_checker.h"
@@ skipping 182 matching lines @@
 
 template <class T, typename Arg1, typename Arg2,
           typename Arg3, typename Arg4, typename Arg5>
 typename Callback5<Arg1, Arg2, Arg3, Arg4, Arg5>::Type* NewCallback(
     T* object,
     void (T::*method)(Arg1, Arg2, Arg3, Arg4, Arg5)) {
   return new CallbackImpl<T, void (T::*)(Arg1, Arg2, Arg3, Arg4, Arg5),
       Tuple5<Arg1, Arg2, Arg3, Arg4, Arg5> >(object, method);
 }
 
+// 6-arg implementation
+template <typename Arg1, typename Arg2, typename Arg3,
+          typename Arg4, typename Arg5, typename Arg6>
+struct Callback6 {
+  typedef CallbackRunner<Tuple6<Arg1, Arg2, Arg3, Arg4, Arg5, Arg6> > Type;
+};
+
+template <class T, typename Arg1, typename Arg2, typename Arg3,
+          typename Arg4, typename Arg5, typename Arg6>
+typename Callback6<Arg1, Arg2, Arg3, Arg4, Arg5, Arg6>::Type* NewCallback(
+    T* object,
+    void (T::*method)(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6)) {
+  return new CallbackImpl<T, void (T::*)(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6),
+      Tuple6<Arg1, Arg2, Arg3, Arg4, Arg5, Arg6> >(object, method);
+}
+
 // An UnboundMethod is a wrapper for a method where the actual object is
 // provided at Run dispatch time.
 template <class T, class Method, class Params>
 class UnboundMethod {
  public:
   UnboundMethod(Method m, const Params& p) : m_(m), p_(p) {
     COMPILE_ASSERT(
         (base::internal::ParamsUseScopedRefptrCorrectly<Params>::value),
         badunboundmethodparams);
   }
@@ skipping 32 matching lines @@
 };
 
 template <class T, typename ReturnValue>
 typename CallbackWithReturnValue<ReturnValue>::Type*
 NewCallbackWithReturnValue(T* object, ReturnValue (T::*method)()) {
   return new CallbackWithReturnValueImpl<T, ReturnValue (T::*)(), ReturnValue>(
       object, method);
 }
 
 #endif  // BASE_CALLBACK_OLD_H_