Clean UP: Remove IBusClientImpl from ui/base/ime/*

ui/base/ime/ime_unittests.gypi

 # 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.
 
 {
   'variables': {
     'ime_test_files': [
       'character_composer_unittest.cc',
       'input_method_ibus_unittest.cc',
-      'mock_ibus_client.h',
-      'mock_ibus_client.cc',
     ],
   },
   'sources': [
     '<@(ime_test_files)',
   ],
   'conditions': [
     ['use_aura==0 or use_x11==0 or chromeos==0', {
       'sources!': [
         '<@(ime_test_files)',
       ],
     }],
   ],
 }