Add a SetDoNotFragment() method to DatagramSocket, and call this for

jingle/glue/fake_ssl_client_socket.h

Index: jingle/glue/fake_ssl_client_socket.h
diff --git a/jingle/glue/fake_ssl_client_socket.h b/jingle/glue/fake_ssl_client_socket.h
index 862c73279f8c57ef59bce58080bb084e8989cb50..f97d926544dfcacc2c7ca551331299ae022b91e0 100644
--- a/jingle/glue/fake_ssl_client_socket.h
+++ b/jingle/glue/fake_ssl_client_socket.h
@@ -55,6 +55,7 @@ class FakeSSLClientSocket : public net::StreamSocket {
             const net::CompletionCallback& callback) override;
   int SetReceiveBufferSize(int32_t size) override;
   int SetSendBufferSize(int32_t size) override;
+  int SetDoNotFragment(bool do_not_fragment) override;
   int Connect(const net::CompletionCallback& callback) override;
   void Disconnect() override;
   bool IsConnected() const override;