Add missing x11 checks in StickyKeysHandler.

ash/sticky_keys/sticky_keys_controller.cc

 // 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.
 
 #include "ash/sticky_keys/sticky_keys_controller.h"
 
 #if defined(USE_X11)
 #include <X11/extensions/XInput2.h>
 #include <X11/Xlib.h>
 #undef RootWindow
@@ skipping 398 matching lines @@
 
   // The action triggered above may have destroyed the event target, in which
   // case we will dispatch the modifier up event to the root window instead.
   aura::Window* modifier_up_target =
       window_tracker.Contains(target) ? target : root_window;
   delegate_->DispatchKeyEvent(modifier_up_event_.get(), modifier_up_target);
   event_from_myself_ = false;
 }
 
 void StickyKeysHandler::AppendNativeEventMask(unsigned int* state) {
+#if defined(USE_X11)
   unsigned int& state_ref = *state;
   switch (modifier_flag_) {
     case ui::EF_CONTROL_DOWN:
       state_ref |= ControlMask;
       break;
     case ui::EF_ALT_DOWN:
       state_ref |= Mod1Mask;
       break;
     case ui::EF_SHIFT_DOWN:
       state_ref |= ShiftMask;
       break;
     default:
       NOTREACHED();
   }
+#endif
 }
 
 void StickyKeysHandler::AppendModifier(ui::KeyEvent* event) {
 #if defined(USE_X11)
   XEvent* xev = event->native_event();
   if (xev) {
     XKeyEvent* xkey = &(xev->xkey);
     AppendNativeEventMask(&xkey->state);
   }
 #elif defined(USE_OZONE)
@@ skipping 29 matching lines @@
           &xievent->mods.effective));
     }
   }
 #elif defined(USE_OZONE)
   NOTIMPLEMENTED() << "Modifier key is not handled";
 #endif
   event->set_flags(event->flags() | modifier_flag_);
 }
 
 }  // namespace ash