Revert of chromeos: Remove some IME methods from ash::SystemTrayDelegate

ui/base/ime/chromeos/mock_input_method_manager.cc

 // Copyright (c) 2012 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 "ui/base/ime/chromeos/mock_input_method_manager.h"
 
 #include <utility>
 
 namespace chromeos {
 namespace input_method {
-
 MockInputMethodManager::State::State() {}
 
-scoped_refptr<InputMethodManager::State> MockInputMethodManager::State::Clone()
-    const {
-  return nullptr;
-}
-
 void MockInputMethodManager::State::AddInputMethodExtension(
     const std::string& extension_id,
     const InputMethodDescriptors& descriptors,
     ui::IMEEngineHandlerInterface* instance) {}
 
 void MockInputMethodManager::State::RemoveInputMethodExtension(
     const std::string& extension_id) {}
 
 void MockInputMethodManager::State::ChangeInputMethod(
     const std::string& input_method_id,
@@ skipping 168 matching lines @@
 
 void MockInputMethodManager::OverrideKeyboardUrlRef(const std::string& keyset) {
 }
 
 bool MockInputMethodManager::IsEmojiHandwritingVoiceOnImeMenuEnabled() {
   return true;
 }
 
 }  // namespace input_method
 }  // namespace chromeos