Turn NULL used as int to 0....

app/gfx/native_widget_types.h

 // Copyright (c) 2009 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 APP_GFX_NATIVE_WIDGET_TYPES_H_
 #define APP_GFX_NATIVE_WIDGET_TYPES_H_
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 
@@ skipping 111 matching lines @@
 // Not inlined because it involves pulling too many headers.
 NativeViewId IdFromNativeView(NativeView view);
 #endif  // defined(USE_X11)
 
 
 // PluginWindowHandle is an abstraction wrapping "the types of windows
 // used by NPAPI plugins".  On Windows it's an HWND, on X it's an X
 // window id.
 #if defined(OS_WIN)
   typedef HWND PluginWindowHandle;
+  const PluginWindowHandle kNullPluginWindow = NULL;
 #elif defined(USE_X11)
   typedef unsigned long PluginWindowHandle;
+  const PluginWindowHandle kNullPluginWindow = 0;
 #else
   // On OS X we don't have windowed plugins.
   // We use a NULL/0 PluginWindowHandle in shared code to indicate there
   // is no window present, so mirror that behavior here.
   typedef bool PluginWindowHandle;
+  const PluginWindowHandle kNullPluginWindow = false;
 #endif
 
 }  // namespace gfx
 
 #endif  // APP_GFX_NATIVE_WIDGET_TYPES_H_