Revert of Removing HTTPS and SOCKS proxy server code.

webrtc/p2p/client/basicportallocator.cc

Index: webrtc/p2p/client/basicportallocator.cc
diff --git a/webrtc/p2p/client/basicportallocator.cc b/webrtc/p2p/client/basicportallocator.cc
index aebe0f24ee6e2834ce73a6a3de23ad862450bd8e..94de2b55f54fbd772fca7c776e8ba6254ede47e6 100644
--- a/webrtc/p2p/client/basicportallocator.cc
+++ b/webrtc/p2p/client/basicportallocator.cc
@@ -699,6 +699,8 @@ void BasicPortAllocatorSession::AddAllocatedPort(Port* port,
   port->set_content_name(content_name());
   port->set_component(component());
   port->set_generation(generation());
+  if (allocator_->proxy().type != rtc::PROXY_NONE)
+    port->set_proxy(allocator_->user_agent(), allocator_->proxy());
   port->set_send_retransmit_count_attribute(
       (flags() & PORTALLOCATOR_ENABLE_STUN_RETRANSMIT_ATTRIBUTE) != 0);