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

chromeos/ime/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',
+      '<(SHARED_INTERMEDIATE_DIR)/chromeos/ime',
   },
   'targets': [
     {
       'target_name': 'gencode',
       'type': 'none',
       'actions': [
         {
           'inputs': [
             'input_methods.txt',
             'gen_input_methods.py',
@@ skipping 12 matching lines @@
         },
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '<(SHARED_INTERMEDIATE_DIR)',
         ],
       },
     },
   ]
 }