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

remoting/host/host_mock_objects.h

Index: remoting/host/host_mock_objects.h
diff --git a/remoting/host/host_mock_objects.h b/remoting/host/host_mock_objects.h
index 569b32489e2e9b24f3eaed5fd5f26d3bec89a8ce..443d84949f04d3ca389729e641f4a80173f80e00 100644
--- a/remoting/host/host_mock_objects.h
+++ b/remoting/host/host_mock_objects.h
@@ -14,6 +14,8 @@
 #include "remoting/host/disconnect_window.h"
 #include "remoting/host/event_executor.h"
 #include "remoting/host/local_input_monitor.h"
+#include "remoting/host/network_settings.h"
+#include "remoting/host/session_manager_factory.h"
 #include "remoting/host/user_authenticator.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
@@ -135,6 +137,27 @@ class MockEventExecutor : public EventExecutor {
   DISALLOW_COPY_AND_ASSIGN(MockEventExecutor);
 };
 
+class MockSessionManagerFactory : public SessionManagerFactory {
+ public:
+  MockSessionManagerFactory();
+  virtual ~MockSessionManagerFactory();
+
+  MOCK_METHOD2(CreateSessionManagerPtr, protocol::SessionManager*(
+      const NetworkSettings& network_settings,
+      const scoped_refptr<net::URLRequestContextGetter>&
+          url_request_context_getter));
+  scoped_ptr<protocol::SessionManager> CreateSessionManager(
+      const NetworkSettings& network_settings,
+      const scoped_refptr<net::URLRequestContextGetter>&
+      url_request_context_getter) {
+    return scoped_ptr<protocol::SessionManager>(CreateSessionManagerPtr(
+        network_settings, url_request_context_getter));
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockSessionManagerFactory);
+};
+
 class MockUserAuthenticator : public UserAuthenticator {
  public:
   MockUserAuthenticator();