Switch from temporary sigslot.h to the right one.

This CL switch only imported header file to unblock WebRTC refactoring
to move sigslot target to proper location. But it is required that
all usages of sigslot will be eliminated from chromium code base. Here
is a ticket to track this effort: https://crbug.com/867820

Bug: 867820, webrtc:8366
Change-Id: I431a178048886833b8bbd8508ce5a3937997f5ab
Reviewed-on: https://chromium-review.googlesource.com/1150537
Reviewed-by: Sergey Ulanov <[email protected]>
Reviewed-by: Kentaro Hara <[email protected]>
Reviewed-by: Olga Sharonova <[email protected]>
Commit-Queue: Artem Titov <[email protected]>
Cr-Commit-Position: refs/heads/master@{#579340}
diff --git a/remoting/protocol/ice_transport_channel.h b/remoting/protocol/ice_transport_channel.h
index d41cc79..bbe337b 100644
--- a/remoting/protocol/ice_transport_channel.h
+++ b/remoting/protocol/ice_transport_channel.h
@@ -20,7 +20,7 @@
 // TODO(johan): Replace #include by forward declaration once proper inheritance
 // is defined for rtc::PacketTransportInterface and cricket::TransportChannel.
 #include "third_party/webrtc/p2p/base/packettransportinterface.h"
-#include "third_party/webrtc/rtc_base/sigslot.h"
+#include "third_party/webrtc/rtc_base/third_party/sigslot/sigslot.h"
 
 namespace cricket {
 class Candidate;