Use platform sized counters for the refcounted classes in base.

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 <stddef.h>
 
 #include <cassert>
@@ skipping 57 matching lines @@
     if (--ref_count_ == 0) {
   #ifndef NDEBUG
       in_dtor_ = true;
   #endif
       return true;
     }
     return false;
   }
 
  private:
-  mutable int ref_count_;
+  mutable size_t ref_count_;

[Tom Sepez, 2016/09/22 17:55:35]

nit: should really be an intprt_t, in case we go back in time to the days of
segemented architectures.

 #ifndef NDEBUG
   mutable bool in_dtor_;
 #endif
 
   DFAKE_MUTEX(add_release_);
 
   DISALLOW_COPY_AND_ASSIGN(RefCountedBase);
 };
 
 class BASE_EXPORT RefCountedThreadSafeBase {
@@ skipping 364 matching lines @@
 bool operator!=(std::nullptr_t null, const scoped_refptr<T>& rhs) {
   return !operator==(null, rhs);
 }
 
 template <typename T>
 std::ostream& operator<<(std::ostream& out, const scoped_refptr<T>& p) {
   return out << p.get();
 }
 
 #endif  // BASE_MEMORY_REF_COUNTED_H_