Move P2P code to content namespace.

content/browser/renderer_host/p2p/socket_dispatcher_host.cc

Index: content/browser/renderer_host/p2p/socket_dispatcher_host.cc
diff --git a/content/browser/renderer_host/p2p/socket_dispatcher_host.cc b/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
index b1a5769255b48eaacb43d9e7b686aaac30004e90..5fa011fe7d10357e6665dce3eee913f429210e4a 100644
--- a/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
+++ b/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
@@ -16,6 +16,8 @@
 #include "net/base/single_request_host_resolver.h"
 #include "net/base/sys_addrinfo.h"
 
+namespace content {
+
 class P2PSocketDispatcherHost::DnsRequest {
  public:
   typedef base::Callback<void(const net::IPAddressNumber&)> DoneCallback;
@@ -281,3 +283,5 @@ void P2PSocketDispatcherHost::OnDestroySocket(const IPC::Message& msg,
     LOG(ERROR) << "Received P2PHostMsg_DestroySocket for invalid socket_id.";
   }
 }
+
+}  // namespace content