[NaCl SDK] Add comments in the implementation code of GoogleDriveFs

native_client_sdk/src/libraries/nacl_io/googledrivefs/googledrivefs_node.cc

Index: native_client_sdk/src/libraries/nacl_io/googledrivefs/googledrivefs_node.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/googledrivefs/googledrivefs_node.cc b/native_client_sdk/src/libraries/nacl_io/googledrivefs/googledrivefs_node.cc
index 506ffd2d127193b7c1406d65d63e5d0c3424a50c..988f290c7fc3f56ad7c4146977ab8936a71d3ffc 100644
--- a/native_client_sdk/src/libraries/nacl_io/googledrivefs/googledrivefs_node.cc
+++ b/native_client_sdk/src/libraries/nacl_io/googledrivefs/googledrivefs_node.cc
@@ -13,6 +13,10 @@
 
 namespace nacl_io {
 
+// This is not further implemented.
+// PNaCl is on a path to deprecation, and WebAssembly is
+// the focused technology.
+
 GoogleDriveFsNode::GoogleDriveFsNode(GoogleDriveFs* googledrivefs)
     : Node(googledrivefs) {}