don't hit NOTREACHED when pasting on non-x11 non-chromeos unix builds

content/renderer/webclipboard_impl.cc

 // Copyright (c) 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 "content/renderer/webclipboard_impl.h"
 
 #include "base/logging.h"
 #include "base/pickle.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 185 matching lines @@
   }
 }
 
 bool WebClipboardImpl::ConvertBufferType(Buffer buffer,
                                          ui::ClipboardType* result) {
   *result = ui::CLIPBOARD_TYPE_COPY_PASTE;
   switch (buffer) {
     case BufferStandard:
       break;
     case BufferSelection:
-#if defined(USE_X11)
-#if defined(OS_CHROMEOS)
-      //  Chrome OS only supports the standard clipboard,
-      //  but not the X selection clipboad.
-      return false;
-#else
+#if defined(USE_X11) && !defined(OS_CHROMEOS)
       *result = ui::CLIPBOARD_TYPE_SELECTION;
       break;
-#endif
+#else
+      // Chrome OS and non-X11 unix builds do not support
+      // the X selection clipboad.
+      // TODO: remove the need for this case, see http://crbug.com/361753
+      return false;
 #endif
     default:
       NOTREACHED();
       return false;
   }
   return true;
 }
 
 }  // namespace content