Replace views::Event with ui::Event.

ui/base/x/events_x.cc

 // Copyright (c) 2012 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 "ui/base/events.h"
 
 #include <string.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xlib.h>
@@ skipping 740 matching lines @@
         case XI_Motion:
            return GetButtonMaskForX2Event(xievent) |
                   GetEventFlagsFromXState(xievent->mods.effective);
       }
     }
   }
   return 0;
 }
 
 base::TimeDelta EventTimeFromNative(const base::NativeEvent& native_event) {
+  // Synthetic events don't have native events.
+  if (!native_event)
+    return base::TimeDelta();
+
   switch(native_event->type) {
     case KeyPress:
     case KeyRelease:
       return base::TimeDelta::FromMilliseconds(native_event->xkey.time);
     case ButtonPress:
     case ButtonRelease:
       return base::TimeDelta::FromMilliseconds(native_event->xbutton.time);
       break;
     case MotionNotify:
       return base::TimeDelta::FromMilliseconds(native_event->xmotion.time);
@@ skipping 213 matching lines @@
     noop->xclient.format = 8;
     DCHECK(!noop->xclient.display);
   }
   // Make sure we use atom from current xdisplay, which may
   // change during the test.
   noop->xclient.message_type = GetNoopEventAtom();
   return noop;
 }
 
 }  // namespace ui