Remove the dependency to ws2_32.dll from talk_base::ThreadManager and talk_base::Thread.

third_party/libjingle/overrides/talk/base/messagequeue.h

Index: third_party/libjingle/overrides/talk/base/messagequeue.h
===================================================================
--- third_party/libjingle/overrides/talk/base/messagequeue.h	(revision 124023)
+++ third_party/libjingle/overrides/talk/base/messagequeue.h	(working copy)
@@ -171,9 +171,14 @@
 
 class MessageQueue {
  public:
-  explicit MessageQueue(SocketServer* ss = NULL);
+  // A phiscal socket server will be created for this ctor.
+  MessageQueue();
+  // If |ss| is NULL, a dummy socket server will be created.
+  explicit MessageQueue(SocketServer* ss);
   virtual ~MessageQueue();
 
+  void Construct();
+
   SocketServer* socketserver() { return ss_; }
   void set_socketserver(SocketServer* ss);