Disable selection on aura. Clipboard semantics on aura must be same as windows

webkit/glue/webclipboard_impl.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 "webkit/glue/webclipboard_impl.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "googleurl/src/gurl.h"
@@ skipping 209 matching lines @@
   }
 }
 
 bool WebClipboardImpl::ConvertBufferType(Buffer buffer,
                                          ui::Clipboard::Buffer* result) {
   switch (buffer) {
     case BufferStandard:
       *result = ui::Clipboard::BUFFER_STANDARD;
       break;
     case BufferSelection:
-#if defined(USE_X11)
+#if defined(USE_X11) && !defined(USE_AURA)
       *result = ui::Clipboard::BUFFER_SELECTION;
       break;
 #endif
     default:
       NOTREACHED();
       return false;
   }
   return true;
 }
 
 }  // namespace webkit_glue