[Chromoting] Make ChromotingHost's dependency on libjingle injected, instead of hard-coded.

remoting/host/host_mock_objects.cc

Index: remoting/host/host_mock_objects.cc
diff --git a/remoting/host/host_mock_objects.cc b/remoting/host/host_mock_objects.cc
index f2b5ef959b432196dd6a89d1649e08e6d18a2bd1..e906443cb81c2c6cd94920cead9ba75bd9abeece 100644
--- a/remoting/host/host_mock_objects.cc
+++ b/remoting/host/host_mock_objects.cc
@@ -6,6 +6,7 @@
 
 #include "base/message_loop_proxy.h"
 #include "net/base/ip_endpoint.h"
+#include "remoting/host/network_settings.h"
 #include "remoting/proto/event.pb.h"
 #include "remoting/protocol/transport.h"
 
@@ -64,6 +65,10 @@ MockClientSessionEventHandler::MockClientSessionEventHandler() {}
 
 MockClientSessionEventHandler::~MockClientSessionEventHandler() {}
 
+MockSessionManagerFactory::MockSessionManagerFactory() {}
+
+MockSessionManagerFactory::~MockSessionManagerFactory() {}
+
 MockUserAuthenticator::MockUserAuthenticator() {}
 
 MockUserAuthenticator::~MockUserAuthenticator() {}