EDK: Move ref counting classes to mojo/edk/util.

mojo/edk/system/core.h

Index: mojo/edk/system/core.h
diff --git a/mojo/edk/system/core.h b/mojo/edk/system/core.h
index 8c794219138fe06ae140cf9663ba50ac84cb5b1f..59fcee848201cff395c7f5347aef23e8613658bd 100644
--- a/mojo/edk/system/core.h
+++ b/mojo/edk/system/core.h
@@ -12,7 +12,7 @@
 #include "mojo/edk/system/mapping_table.h"
 #include "mojo/edk/system/memory.h"
 #include "mojo/edk/system/mutex.h"
-#include "mojo/edk/system/ref_ptr.h"
+#include "mojo/edk/util/ref_ptr.h"
 #include "mojo/public/c/system/buffer.h"
 #include "mojo/public/c/system/data_pipe.h"
 #include "mojo/public/c/system/message_pipe.h"
@@ -48,7 +48,7 @@ class Core {
 
   // Looks up the dispatcher for the given handle. Returns null if the handle is
   // invalid.
-  RefPtr<Dispatcher> GetDispatcher(MojoHandle handle);
+  util::RefPtr<Dispatcher> GetDispatcher(MojoHandle handle);
 
   // Like |GetDispatcher()|, but also removes the handle from the handle table.
   // On success, gets the dispatcher for a given handle (which should not be
@@ -57,7 +57,7 @@ class Core {
   // |MOJO_RESULT_INVALID_ARGUMENT| if there's no dispatcher for the given
   // handle or |MOJO_RESULT_BUSY| if the handle is marked as busy.)
   MojoResult GetAndRemoveDispatcher(MojoHandle handle,
-                                    RefPtr<Dispatcher>* dispatcher);
+                                    util::RefPtr<Dispatcher>* dispatcher);
 
   // Watches on the given handle for the given signals, calling |callback| when
   // a signal is satisfied or when all signals become unsatisfiable. |callback|