[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/mount.h

Index: native_client_sdk/src/libraries/nacl_io/mount.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount.h b/native_client_sdk/src/libraries/nacl_io/mount.h
index 58cf1a4ed1029048713299b616172e260083dc24..3f6318b95ab05948ca3c0a76c05db83a7d6d96da 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount.h
@@ -17,16 +17,18 @@
 #include "sdk_util/ref_object.h"
 #include "sdk_util/scoped_ref.h"
 
+namespace nacl_io {
+
 class Mount;
 class MountNode;
 class PepperInterface;
 
-typedef ScopedRef<Mount> ScopedMount;
+typedef sdk_util::ScopedRef<Mount> ScopedMount;
 typedef std::map<std::string, std::string> StringMap_t;
 
 // NOTE: The KernelProxy is the only class that should be setting errno. All
 // other classes should return Error (as defined by nacl_io/error.h).
-class Mount : public RefObject {
+class Mount : public sdk_util::RefObject {
  protected:
   // The protected functions are only used internally and will not
   // acquire or release the mount's lock.
@@ -90,4 +92,6 @@ class Mount : public RefObject {
   DISALLOW_COPY_AND_ASSIGN(Mount);
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_MOUNT_H_