Revert of Removing references to webrtc::PortAllocatorFactoryInterface.

remoting/protocol/chromium_port_allocator.h

Index: remoting/protocol/chromium_port_allocator.h
diff --git a/remoting/protocol/chromium_port_allocator.h b/remoting/protocol/chromium_port_allocator.h
index 021000ed5699db3fef4a6b6c4cbb5d7bed8de8ff..a2b759c18739166cafae010205dc04ddedae8911 100644
--- a/remoting/protocol/chromium_port_allocator.h
+++ b/remoting/protocol/chromium_port_allocator.h
@@ -9,8 +9,11 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "net/url_request/url_request_context_getter.h"
 #include "third_party/webrtc/p2p/client/httpportallocator.h"
+
+namespace net {
+class URLRequestContextGetter;
+}  // namespace net
 
 namespace remoting {
 namespace protocol {