ozone: Fix libbase_nacl build after MessagePumpOzone removal

base/message_loop/message_loop.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 567 matching lines @@
 #endif
 
 #if !defined(OS_NACL) && (defined(TOOLKIT_GTK) || \
                           defined(OS_WIN) || defined(USE_X11))
   // Please see message_pump_win/message_pump_glib for definitions of these
   // methods.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 #endif
 
-#if defined(USE_OZONE)
+#if defined(USE_OZONE) && !defined(OS_NACL)
   // Please see MessagePumpLibevent for definition.
   bool WatchFileDescriptor(
       int fd,
       bool persistent,
       MessagePumpLibevent::Mode mode,
       MessagePumpLibevent::FileDescriptorWatcher* controller,
       MessagePumpLibevent::Watcher* delegate);
 #endif
 
  protected:
@@ skipping 118 matching lines @@
 
 // Do not add any member variables to MessageLoopForIO!  This is important b/c
 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO).  Any extra
 // data that you need should be stored on the MessageLoop's pump_ instance.
 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
                MessageLoopForIO_should_not_have_extra_member_variables);
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_