Extract input_method_whitelist.{h|cc} from c/b/chromeos.

chrome/browser/chromeos/input_method/input_method.gyp

-# 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': {
-    'input_method_out_dir':
-      '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/chromeos/input_method',
-  },
-  'targets': [
-    {
-      'target_name': 'gencode',
-      'type': 'none',
-      'actions': [
-        {
-          'inputs': [
-            'input_methods.txt',
-            'gen_input_methods.py',
-          ],
-          'outputs': [
-            '<(input_method_out_dir)/input_methods.h',
-          ],
-          'action_name': 'gen_input_methods',
-          'action': [
-            'python',
-            'gen_input_methods.py',
-            'input_methods.txt',
-            '<(input_method_out_dir)/input_methods.h',
-          ],
-          'message': 'Generating input_methods.h',
-        },
-      ],
-      'direct_dependent_settings': {
-        'include_dirs': [
-          '<(SHARED_INTERMEDIATE_DIR)',
-        ],
-      },
-    },
-  ]
-}