Wrap the p2p transport API in a compile time flag.

content/renderer/pepper_plugin_delegate_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/pepper_plugin_delegate_impl.h"
 
 #include <cmath>
 #include <queue>
 
 #include "base/callback.h"
@@ skipping 1162 matching lines @@
 void PepperPluginDelegateImpl::SaveAs() {
   render_view_->Send(new ViewHostMsg_SaveAs(
       render_view_->routing_id()));
 }
 
 P2PSocketDispatcher* PepperPluginDelegateImpl::GetP2PSocketDispatcher() {
   return render_view_->p2p_socket_dispatcher();
 }
 
 webkit_glue::P2PTransport* PepperPluginDelegateImpl::CreateP2PTransport() {
+#if defined(ENABLE_P2P_APIS)
   return new P2PTransportImpl(render_view_->p2p_socket_dispatcher());
+#else
+  return NULL;
+#endif
 }