Add "PRIVATE" to the enum names of some private Pepper networking APIs:

ppapi/shared_impl/private/net_address_private_impl.cc

Index: ppapi/shared_impl/private/net_address_private_impl.cc
diff --git a/ppapi/shared_impl/private/net_address_private_impl.cc b/ppapi/shared_impl/private/net_address_private_impl.cc
index 35231d5cac28c8d819305840c2efff3b88dddf7f..19dae3c8b180021cf3da23253c53feb3913f8ebc 100644
--- a/ppapi/shared_impl/private/net_address_private_impl.cc
+++ b/ppapi/shared_impl/private/net_address_private_impl.cc
@@ -133,9 +133,9 @@ bool IsValid(const NetAddress* net_addr) {
 PP_NetAddressFamily_Private GetFamily(const PP_NetAddress_Private* addr) {
   const NetAddress* net_addr = ToNetAddress(addr);
   if (!IsValid(net_addr))
-    return PP_NETADDRESSFAMILY_UNSPECIFIED;
+    return PP_NETADDRESSFAMILY_PRIVATE_UNSPECIFIED;
   return net_addr->is_ipv6 ?
-         PP_NETADDRESSFAMILY_IPV6 : PP_NETADDRESSFAMILY_IPV4;
+         PP_NETADDRESSFAMILY_PRIVATE_IPV6 : PP_NETADDRESSFAMILY_PRIVATE_IPV4;
 }
 
 uint16_t GetPort(const PP_NetAddress_Private* addr) {