Move P2P code to content namespace.

content/browser/renderer_host/p2p/socket_host_udp.cc

Index: content/browser/renderer_host/p2p/socket_host_udp.cc
diff --git a/content/browser/renderer_host/p2p/socket_host_udp.cc b/content/browser/renderer_host/p2p/socket_host_udp.cc
index e03af8e5731adf43f2cf99d344e64219358bf27e..1e082729ad7b3bb4bd958a2ed2d16a58419537fa 100644
--- a/content/browser/renderer_host/p2p/socket_host_udp.cc
+++ b/content/browser/renderer_host/p2p/socket_host_udp.cc
@@ -16,6 +16,8 @@ const int kReadBufferSize = 65536;
 
 }  // namespace
 
+namespace content {
+
 P2PSocketHostUdp::P2PSocketHostUdp(IPC::Message::Sender* message_sender,
                                    int routing_id, int id)
     : P2PSocketHost(message_sender, routing_id, id),
@@ -169,3 +171,5 @@ P2PSocketHost* P2PSocketHostUdp::AcceptIncomingTcpConnection(
   OnError();
   return NULL;
 }
+
+}  // namespace content