Revert of Implement ui::ClipboardMus.

ui/base/x/selection_utils.h

 // 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.
 
 #ifndef UI_BASE_X_SELECTION_UTILS_H_
 #define UI_BASE_X_SELECTION_UTILS_H_
 
 #include <stddef.h>
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
 #include <map>
 
 #include "base/memory/ref_counted_memory.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/ui_base_export.h"
 #include "ui/gfx/x/x11_atom_cache.h"
 
 namespace ui {
 class SelectionData;
 class X11AtomCache;
 
+extern const char kMimeTypeMozillaURL[];
 extern const char kString[];
 extern const char kText[];
 extern const char kUtf8String[];
 
 // Returns a list of all text atoms that we handle.
 UI_BASE_EXPORT std::vector< ::Atom> GetTextAtomsFrom(
     const X11AtomCache* atom_cache);
 
 UI_BASE_EXPORT std::vector< ::Atom> GetURLAtomsFrom(
     const X11AtomCache* atom_cache);
@@ skipping 87 matching lines @@
  private:
   ::Atom type_;
   scoped_refptr<base::RefCountedMemory> memory_;
 
   X11AtomCache atom_cache_;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_X_SELECTION_UTILS_H_