Make sure that scoped_ptr<> cannot be used with ref-counted objects.

base/memory/scoped_ptr.h

Index: base/memory/scoped_ptr.h
diff --git a/base/memory/scoped_ptr.h b/base/memory/scoped_ptr.h
index 77a203992038f07687baad78a0b37ea55b21ba97..bc38c8d9b77f7ee68da916627c0a21f0d8cb9805 100644
--- a/base/memory/scoped_ptr.h
+++ b/base/memory/scoped_ptr.h
@@ -96,8 +96,30 @@
 #include <stddef.h>
 #include <stdlib.h>
 
+#include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/move.h"
+#include "base/template_util.h"
+
+namespace base {
+
+namespace subtle {
+class RefCountedBase;
+class RefCountedThreadSafeBase;
+}  // namespace subtle
+
+namespace internal {
+
+template <typename T> struct IsNotRefCounted {
+  enum {
+    value = !base::is_convertible<T*, base::subtle::RefCountedBase*>::value &&
+        !base::is_convertible<T*, base::subtle::RefCountedThreadSafeBase*>::
+            value
+  };
+};
+
+}  // namespace internal
+}  // namespace base
 
 // A scoped_ptr<T> is like a T*, except that the destructor of scoped_ptr<T>
 // automatically deletes the pointer it holds (if any).
@@ -112,6 +134,9 @@ template <class C>
 class scoped_ptr {
   MOVE_ONLY_TYPE_FOR_CPP_03(scoped_ptr, RValue)
 
+  COMPILE_ASSERT(base::internal::IsNotRefCounted<C>::value,
+                 C_is_refcounted_type_and_needs_scoped_refptr);
+
  public:
 
   // The element type