First patch in making destructors of refcounted objects private.

base/ref_counted_memory.h

Index: base/ref_counted_memory.h
===================================================================
--- base/ref_counted_memory.h	(revision 30973)
+++ base/ref_counted_memory.h	(working copy)
@@ -15,16 +15,19 @@
 // A generic interface to memory. This object is reference counted because one
 // of its two subclasses own the data they carry, and we need to have
 // heterogeneous containers of these two types of memory.
-class RefCountedMemory : public base::RefCountedThreadSafe< RefCountedMemory > {
+class RefCountedMemory : public base::RefCountedThreadSafe<RefCountedMemory> {
  public:
-  virtual ~RefCountedMemory() {}
-
   // Retrieves a pointer to the beginning of the data we point to. If the data
   // is empty, this will return NULL.
   virtual const unsigned char* front() const = 0;
 
   // Size of the memory pointed to.
   virtual size_t size() const = 0;
+
+ protected:
+  friend class base::RefCountedThreadSafe<RefCountedMemory>;
+
+  virtual ~RefCountedMemory() {}
 };
 
 // An implementation of RefCountedMemory, where the ref counting does not