Use common generated file for inputMethodPrivate APIs.

chrome/common/extensions/api/schemas.gypi

 # 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.
 
 {
   'sources': [
     '<@(schema_files)',
   ],
   'variables': {
     'main_schema_files': [
@@ skipping 102 matching lines @@
       'enterprise_platform_keys.idl',
       'enterprise_platform_keys_internal.idl',
       'enterprise_platform_keys_private.json',
       'file_browser_handler_internal.json',
       'file_manager_private.idl',
       'file_manager_private_internal.idl',
       'file_system_provider.idl',
       'file_system_provider_internal.idl',
       'first_run_private.json',
       'input_ime.json',
+      'input_method_private.json',
       'launcher_search_provider.idl',
       'log_private.idl',
       'platform_keys.idl',
       'platform_keys_internal.idl',
       'terminal_private.json',
       'users_private.idl',
       'wallpaper.json',
       'wallpaper_private.json',
     ],
     'chromeos_non_compiled_schema_files': [
@@ skipping 61 matching lines @@
           '<@(webrtc_schema_files)',
         ],
       }],
     ],
     'cc_dir': 'chrome/common/extensions/api',
     'root_namespace': 'extensions::api::%(namespace)s',
     'bundle_name': 'Chrome',
     'impl_dir_': 'chrome/browser/extensions/api',
   },
 }