Disable implicit conversion of scoped_refptr<T> to T* on Windows.

base/memory/ref_counted.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_MEMORY_REF_COUNTED_H_
 #define BASE_MEMORY_REF_COUNTED_H_
 
 #include <cassert>
 #include <iosfwd>
 
 #include "base/atomic_ref_count.h"
 #include "base/base_export.h"
 #include "base/compiler_specific.h"
 #ifndef NDEBUG
 #include "base/logging.h"
 #endif
 #include "base/threading/thread_collision_warner.h"
 #include "build/build_config.h"
 
-#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_IOS) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_IOS) || defined(OS_ANDROID) || defined(OS_WIN)

[Nico, 2014/11/22 01:19:24]

Is anything missing from this list? Might want to remove the macro completely?
(but can be a in a follow-up too)

[dcheng, 2014/11/22 01:20:22]

I wanted to do that in a followup--just in case there's obscure platform I
forgot to handle.

 #define DISABLE_SCOPED_REFPTR_CONVERSION_OPERATOR
 #endif
 
 namespace base {
 
 namespace subtle {
 
 class BASE_EXPORT RefCountedBase {
  public:
   bool HasOneRef() const { return ref_count_ == 1; }
@@ skipping 380 matching lines @@
   return !operator==(lhs, rhs);
 }
 
 template <typename T>
 std::ostream& operator<<(std::ostream& out, const scoped_refptr<T>& p) {
   return out << p.get();
 }
 #endif  // defined(DISABLE_SCOPED_REFPTR_CONVERSION_OPERATOR)
 
 #endif  // BASE_MEMORY_REF_COUNTED_H_