Base: First pass at having base.dll: definition of

base/ref_counted.h

Index: base/ref_counted.h
===================================================================
--- base/ref_counted.h	(revision 78949)
+++ base/ref_counted.h	(working copy)
@@ -7,13 +7,14 @@
 #pragma once
 
 #include "base/atomic_ref_count.h"
+#include "base/base_api.h"
 #include "base/threading/thread_collision_warner.h"
 
 namespace base {
 
 namespace subtle {
 
-class RefCountedBase {
+class BASE_API RefCountedBase {
  public:
   static bool ImplementsThreadSafeReferenceCounting() { return false; }
 
@@ -39,7 +40,7 @@
   DISALLOW_COPY_AND_ASSIGN(RefCountedBase);
 };
 
-class RefCountedThreadSafeBase {
+class BASE_API RefCountedThreadSafeBase {
  public:
   static bool ImplementsThreadSafeReferenceCounting() { return true; }