Add const to BindStateBase to align RefCounted constness

base/callback_internal.cc

 // 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.
 
 #include "base/callback_internal.h"
 
 #include "base/logging.h"
 
 namespace base {
 namespace internal {
 
 namespace {
 
 bool ReturnFalse(const BindStateBase*) {
   return false;
 }
 
 }  // namespace
 
 BindStateBase::BindStateBase(InvokeFuncStorage polymorphic_invoke,
-                             void (*destructor)(BindStateBase*))
+                             void (*destructor)(const BindStateBase*))
     : BindStateBase(polymorphic_invoke, destructor, &ReturnFalse) {
 }
 
 BindStateBase::BindStateBase(InvokeFuncStorage polymorphic_invoke,
-                             void (*destructor)(BindStateBase*),
+                             void (*destructor)(const BindStateBase*),
                              bool (*is_cancelled)(const BindStateBase*))
     : polymorphic_invoke_(polymorphic_invoke),
       ref_count_(0),
       destructor_(destructor),
       is_cancelled_(is_cancelled) {}
 
-void BindStateBase::AddRef() {
+void BindStateBase::AddRef() const {
   AtomicRefCountInc(&ref_count_);
 }
 
-void BindStateBase::Release() {
+void BindStateBase::Release() const {
   if (!AtomicRefCountDec(&ref_count_))
     destructor_(this);
 }
 
 CallbackBase<CopyMode::MoveOnly>::CallbackBase(CallbackBase&& c) = default;
 
 CallbackBase<CopyMode::MoveOnly>&
 CallbackBase<CopyMode::MoveOnly>::operator=(CallbackBase&& c) = default;
 
 CallbackBase<CopyMode::MoveOnly>::CallbackBase(
@@ skipping 45 matching lines @@
 }
 
 CallbackBase<CopyMode::Copyable>&
 CallbackBase<CopyMode::Copyable>::operator=(CallbackBase&& c) = default;
 
 template class CallbackBase<CopyMode::MoveOnly>;
 template class CallbackBase<CopyMode::Copyable>;
 
 }  // namespace internal
 }  // namespace base