autofill: Refactor PersonalDataManager::Observer into its own header file.

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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': 'browser',
       'type': 'static_library',
       'dependencies': [
@@ skipping 163 matching lines @@
         'browser/autofill/form_group.h',
         'browser/autofill/form_structure.cc',
         'browser/autofill/form_structure.h',
         'browser/autofill/home_phone_number.cc',
         'browser/autofill/home_phone_number.h',
         'browser/autofill/name_field.cc',
         'browser/autofill/name_field.h',
         'browser/autofill/personal_data_manager.cc',
         'browser/autofill/personal_data_manager.h',
         'browser/autofill/personal_data_manager_mac.mm',
+        'browser/autofill/personal_data_manager_observer.h',
         'browser/autofill/phone_field.cc',
         'browser/autofill/phone_field.h',
         'browser/autofill/phone_number.cc',
         'browser/autofill/phone_number.h',
         'browser/autofill/phone_number_i18n.cc',
         'browser/autofill/phone_number_i18n.h',
         'browser/autofill/select_control_handler.cc',
         'browser/autofill/select_control_handler.h',
         'browser/automation/automation_browser_tracker.cc',
         'browser/automation/automation_browser_tracker.h',
@@ skipping 4709 matching lines @@
       ],
       'export_dependent_settings': [
         'in_memory_url_index_cache_proto',
       ],
       # This target exports a hard dependency because it includes generated
       # header files.
       'hard_dependency': 1,
     },
   ],
 }