Move P2P code to content namespace.

content/browser/renderer_host/p2p/socket_host.h

Index: content/browser/renderer_host/p2p/socket_host.h
diff --git a/content/browser/renderer_host/p2p/socket_host.h b/content/browser/renderer_host/p2p/socket_host.h
index 023b7219db789cc01ff6282795f08f2846b01429..a3af7b3ef4d693af9a347f4327237d9914327c53 100644
--- a/content/browser/renderer_host/p2p/socket_host.h
+++ b/content/browser/renderer_host/p2p/socket_host.h
@@ -10,6 +10,8 @@
 #include "ipc/ipc_message.h"
 #include "net/base/ip_endpoint.h"
 
+namespace content {
+
 // Base class for P2P sockets.
 class P2PSocketHost {
  public:
@@ -72,4 +74,6 @@ class P2PSocketHost {
   DISALLOW_COPY_AND_ASSIGN(P2PSocketHost);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_