Revert of Implement ui::ClipboardMus.

mojo/common/common_type_converters.h

 // Copyright 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 MOJO_COMMON_COMMON_TYPE_CONVERTERS_H_
 #define MOJO_COMMON_COMMON_TYPE_CONVERTERS_H_
 
 #include <stdint.h>
 
 #include "base/strings/string16.h"
@@ skipping 29 matching lines @@
 struct MOJO_COMMON_EXPORT TypeConverter<std::string, Array<uint8_t>> {
   static std::string Convert(const Array<uint8_t>& input);
 };
 
 template <>
 struct MOJO_COMMON_EXPORT TypeConverter<Array<uint8_t>, std::string> {
   static Array<uint8_t> Convert(const std::string& input);
 };
 
 template <>
-struct MOJO_COMMON_EXPORT TypeConverter<Array<uint8_t>, base::StringPiece> {
-  static Array<uint8_t> Convert(const base::StringPiece& input);
-};
-
-template <>
 struct MOJO_COMMON_EXPORT TypeConverter<base::string16, Array<uint8_t>> {
   static base::string16 Convert(const Array<uint8_t>& input);
 };
 
 template <>
 struct MOJO_COMMON_EXPORT TypeConverter<Array<uint8_t>, base::string16> {
   static Array<uint8_t> Convert(const base::string16& input);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_COMMON_TYPE_CONVERTERS_H_