Moved remoting::win::MessageWindow to base::win::MessageWindow so that it could be re-used outside …

remoting/host/win/host_service.h

Index: remoting/host/win/host_service.h
diff --git a/remoting/host/win/host_service.h b/remoting/host/win/host_service.h
index a5910712b95009a3dd64c7302a40ac76d9a68df5..aa1cecad2caa6130eb13e0a6313310e3c764b831 100644
--- a/remoting/host/win/host_service.h
+++ b/remoting/host/win/host_service.h
@@ -13,8 +13,8 @@
 #include "base/memory/singleton.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/win/message_window.h"
 #include "net/base/ip_endpoint.h"
-#include "remoting/host/win/message_window.h"
 #include "remoting/host/win/wts_terminal_monitor.h"
 
 class CommandLine;
@@ -29,7 +29,7 @@ class AutoThreadTaskRunner;
 class DaemonProcess;
 class WtsTerminalObserver;
 
-class HostService : public win::MessageWindow::Delegate,
+class HostService : public base::win::MessageWindow::Delegate,
                     public WtsTerminalMonitor {
  public:
   static HostService* GetInstance();
@@ -72,7 +72,7 @@ class HostService : public win::MessageWindow::Delegate,
   // Stops and deletes |daemon_process_|.
   void StopDaemonProcess();
 
-  // win::MessageWindow::Delegate interface.
+  // base::win::MessageWindow::Delegate interface.
   virtual bool HandleMessage(HWND hwnd,
                              UINT message,
                              WPARAM wparam,