[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/mount_factory.h

Index: native_client_sdk/src/libraries/nacl_io/mount_factory.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_factory.h b/native_client_sdk/src/libraries/nacl_io/mount_factory.h
index 35f77d7609e609380b3ce9f43cd04b228e3cf43f..2cd1061451e9176591920659d3e2706a50f96ca6 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_factory.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount_factory.h
@@ -11,6 +11,8 @@
 #include "nacl_io/error.h"
 #include "sdk_util/scoped_ref.h"
 
+namespace nacl_io {
+
 class PepperInterface;
 class Mount;
 
@@ -22,8 +24,10 @@ class MountFactory {
   virtual Error CreateMount(int dev,
                             StringMap_t& args,
                             PepperInterface* ppapi,
-                            ScopedRef<Mount>* out_mount) = 0;
+                            sdk_util::ScopedRef<Mount>* out_mount) = 0;
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_MOUNT_FACTORY_H_