Add more IPC unit tests:

remoting/host/ipc_desktop_environment.h

Index: remoting/host/ipc_desktop_environment.h
diff --git a/remoting/host/ipc_desktop_environment.h b/remoting/host/ipc_desktop_environment.h
index a89b5e8635f1ee35548f254bb399137b1a9f6078..be20cff4b91f4697a1df1efde626326a92f6914f 100644
--- a/remoting/host/ipc_desktop_environment.h
+++ b/remoting/host/ipc_desktop_environment.h
@@ -21,7 +21,7 @@ class SingleThreadTaskRunner;
 }  // base
 
 namespace IPC {
-class ChannelProxy;
+class Sender;
 }  // namespace IPC
 
 namespace remoting {
@@ -83,7 +83,7 @@ class IpcDesktopEnvironmentFactory
   IpcDesktopEnvironmentFactory(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
-      IPC::ChannelProxy* daemon_channel);
+      IPC::Sender* daemon_channel);
   virtual ~IpcDesktopEnvironmentFactory();
 
   // DesktopEnvironmentFactory implementation.
@@ -111,7 +111,7 @@ class IpcDesktopEnvironmentFactory
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   // IPC channel connected to the daemon process.
-  IPC::ChannelProxy* daemon_channel_;
+  IPC::Sender* daemon_channel_;
 
   // List of DesktopEnvironment instances we've told the daemon process about.
   typedef std::map<int, scoped_refptr<DesktopSessionProxy> >