Delete InputMethodEngine::CreateEngine and call the InputMethodEngineIBus contructor directly.

chrome/browser/chromeos/input_method/input_method_engine.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 220 matching lines @@
   // the surrounding text. The |offset| is relative position based on current
   // caret.
   // NOTE: Currently we are falling back to backspace forwarding workaround,
   // because delete_surrounding_text is not supported in Chrome. So this
   // function is restricted for only preceding text.
   // TODO(nona): Support full spec delete surrounding text.
   virtual bool DeleteSurroundingText(int context_id,
                                      int offset,
                                      size_t number_of_chars,
                                      std::string* error) = 0;
-
-  // Create an IME engine.
-  static InputMethodEngine* CreateEngine(
-      InputMethodEngine::Observer* observer,
-      const char* engine_name,
-      const char* extension_id,
-      const char* engine_id,
-      const char* description,
-      const std::vector<std::string>& language,
-      const std::vector<std::string>& layouts,
-      const GURL& options_page,
-      const GURL& input_view,
-      std::string* error);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_H_