Move RefCountedMemory class to base namespace.

base/memory/ref_counted_memory.h

Index: base/memory/ref_counted_memory.h
===================================================================
--- base/memory/ref_counted_memory.h	(revision 134496)
+++ base/memory/ref_counted_memory.h	(working copy)
@@ -13,8 +13,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 
-// TODO(erg): The contents of this file should be in a namespace. This would
-// require touching >100 files in chrome/ though.
+namespace base {
 
 // 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
@@ -35,8 +34,6 @@
   virtual ~RefCountedMemory();
 };
 
-namespace base {
-
 // An implementation of RefCountedMemory, where the ref counting does not
 // matter.
 class BASE_EXPORT RefCountedStaticMemory : public RefCountedMemory {