Coverity fixes for uninitialized vars

ui/base/win/events_win.cc

 // Copyright (c) 2011 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 <windowsx.h>
 
 #include "ui/base/events.h"
 
 #include "base/logging.h"
 #include "ui/base/keycodes/keyboard_code_conversion_win.h"
@@ skipping 247 matching lines @@
                       float* y_offset) {
   NOTIMPLEMENTED();
   return false;
 }
 
 void UpdateDeviceList() {
   NOTIMPLEMENTED();
 }
 
 base::NativeEvent CreateNoopEvent() {
-  MSG event;
+  MSG event = { NULL };
   event.message = WM_USER;
-  event.wParam = 0;
-  event.lParam = 0;
   return event;
 }
 
 }  // namespace ui