Move P2P code to content namespace.

content/browser/renderer_host/p2p/socket_host_udp_unittest.cc

Index: content/browser/renderer_host/p2p/socket_host_udp_unittest.cc
diff --git a/content/browser/renderer_host/p2p/socket_host_udp_unittest.cc b/content/browser/renderer_host/p2p/socket_host_udp_unittest.cc
index e40d28842bc720c4c8fb8067aa2af96c13dd80b1..d4c19b5b2b0033039a314f124e50e5d4580e5c68 100644
--- a/content/browser/renderer_host/p2p/socket_host_udp_unittest.cc
+++ b/content/browser/renderer_host/p2p/socket_host_udp_unittest.cc
@@ -113,6 +113,8 @@ class FakeDatagramServerSocket : public net::DatagramServerSocket {
 
 }  // namespace
 
+namespace content {
+
 class P2PSocketHostUdpTest : public testing::Test {
  protected:
   virtual void SetUp() OVERRIDE {
@@ -236,3 +238,5 @@ TEST_F(P2PSocketHostUdpTest, SendAfterStunResponseDifferentHost) {
       .WillOnce(DoAll(DeleteArg<0>(), Return(true)));
   socket_host_->Send(dest2_, packet);
 }
+
+}  // namespace content