try 3 of: Split out InputMethodMenuManager from InputMethodManager.

chrome/browser/chromeos/input_method/mock_input_method_engine.h

 // Copyright 2014 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_MOCK_INPUT_METHOD_ENGINE_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_MOCK_INPUT_METHOD_ENGINE_H_
 
 #include <string>
 #include <vector>
 #include "chrome/browser/chromeos/input_method/input_method_engine_interface.h"
 #include "chromeos/ime/input_method_descriptor.h"
 #include "url/gurl.h"
 
 namespace ui {
 class KeyEvent;
 }  // namespace ui
 
+namespace ash {
+namespace ime {
+struct InputMethodMenuItem;
+}  // namespace ime
+}  // namespace ash
+
 namespace chromeos {
 
 class CompositionText;
 
 namespace input_method {
 class CandidateWindow;
-struct InputMethodProperty;
 struct KeyEventHandle;
 }  // namespace input_method
 
 class MockInputMethodEngine : public InputMethodEngineInterface {
  public:
   explicit MockInputMethodEngine(
       const input_method::InputMethodDescriptor& descriptor);
   virtual ~MockInputMethodEngine();
 
   // InputMethodEngineInterface overrides.
@@ skipping 52 matching lines @@
   // Descriptor of this input method.
   input_method::InputMethodDescriptor descriptor_;
 
   // The current candidate window property.
   CandidateWindowProperty candidate_window_property_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_MOCK_INPUT_METHOD_ENGINE_H_