Made DesktopEnvironment responsible for creation of the disconnect window.

remoting/remoting.gyp

Index: remoting/remoting.gyp
diff --git a/remoting/remoting.gyp b/remoting/remoting.gyp
index 93ec17e4bbd6ec37c752e0a9a5d865b205cbe107..0b28b69899d76e15844c7291e34b26d68be78fef 100644
--- a/remoting/remoting.gyp
+++ b/remoting/remoting.gyp
@@ -345,7 +345,6 @@
             'host/desktop_session_connector.h',
             'host/desktop_session_proxy.cc',
             'host/desktop_session_proxy.h',
-            'host/disconnect_window.h',
             'host/disconnect_window_gtk.cc',
             'host/disconnect_window_mac.h',
             'host/disconnect_window_mac.mm',
@@ -367,22 +366,25 @@
             'host/host_status_observer.h',
             'host/host_user_interface.cc',
             'host/host_user_interface.h',
+            'host/host_window.h',
+            'host/host_window_proxy.cc',
+            'host/host_window_proxy.h',
+            'host/in_memory_host_config.cc',
+            'host/in_memory_host_config.h',
             'host/input_injector.h',
             'host/input_injector_linux.cc',
             'host/input_injector_mac.cc',
             'host/input_injector_win.cc',
-            'host/in_memory_host_config.cc',
-            'host/in_memory_host_config.h',
             'host/ipc_audio_capturer.cc',
             'host/ipc_audio_capturer.h',
             'host/ipc_constants.cc',
             'host/ipc_constants.h',
             'host/ipc_desktop_environment.cc',
             'host/ipc_desktop_environment.h',
-            'host/ipc_input_injector.cc',
-            'host/ipc_input_injector.h',
             'host/ipc_host_event_logger.cc',
             'host/ipc_host_event_logger.h',
+            'host/ipc_input_injector.cc',
+            'host/ipc_input_injector.h',
             'host/ipc_screen_controls.cc',
             'host/ipc_screen_controls.h',
             'host/ipc_video_frame_capturer.cc',