ui: Cleanup class/struct forward declarations

ui/base/ime/chromeos/ime_keyboard.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 UI_BASE_IME_CHROMEOS_IME_KEYBOARD_H_
 #define UI_BASE_IME_CHROMEOS_IME_KEYBOARD_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 15 matching lines @@
   kAltKey,  // Customizable.
   kVoidKey,
   kCapsLockKey,  // Customizable.
   kEscapeKey,  // Customizable.
   kBackspaceKey,  // Customizable.
   // IMPORTANT: Add new key to the end, because the keys may have been stored
   // in user preferences.
   kNumModifierKeys,
 };
 
-class InputMethodUtil;
-
 class UI_BASE_IME_EXPORT ImeKeyboard {
  public:
   class Observer {
    public:
     // Called when the caps lock state has changed.
     virtual void OnCapsLockChanged(bool enabled) = 0;
   };
 
   ImeKeyboard();
   virtual ~ImeKeyboard();
@@ skipping 68 matching lines @@
   std::string last_layout_;
 
  private:
   base::ObserverList<Observer> observers_;
 };
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // UI_BASE_IME_CHROMEOS_IME_KEYBOARD_H_