Move SigninManagerDelegate into the Signin component.

components/signin.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.
 
 {
   'targets': [
     {
       'target_name': 'signin_core',
       'type': 'static_library',
       'dependencies': [
         'encryptor',
         'webdata_common',
         '../base/base.gyp:base',
         '../sql/sql.gyp:sql',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+        'signin/core/signin_manager_delegate.h',
         'signin/core/webdata/token_service_table.cc',
         'signin/core/webdata/token_service_table.h',
         'signin/core/webdata/token_web_data.cc',
         'signin/core/webdata/token_web_data.h',
       ],
     },
   ],
 }