Get rid of trivial IncognitoUserPrefStore and PerTabUserPrefStore.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1869 matching lines @@
         'browser/preferences_mac.cc',
         'browser/preferences_mac.h',
         'browser/prefs/browser_prefs.cc',
         'browser/prefs/browser_prefs.h',
         'browser/prefs/command_line_pref_store.cc',
         'browser/prefs/command_line_pref_store.h',
         'browser/prefs/default_pref_store.cc',
         'browser/prefs/default_pref_store.h',
         'browser/prefs/incognito_mode_prefs.cc',
         'browser/prefs/incognito_mode_prefs.h',
-        'browser/prefs/incognito_user_pref_store.cc',
-        'browser/prefs/incognito_user_pref_store.h',
         'browser/prefs/overlay_user_pref_store.cc',
         'browser/prefs/overlay_user_pref_store.h',
-        'browser/prefs/per_tab_user_pref_store.cc',
-        'browser/prefs/per_tab_user_pref_store.h',
         'browser/prefs/pref_change_registrar.cc',
         'browser/prefs/pref_change_registrar.h',
         'browser/prefs/pref_member.cc',
         'browser/prefs/pref_member.h',
         'browser/prefs/pref_model_associator.cc',
         'browser/prefs/pref_model_associator.h',
         'browser/prefs/pref_notifier.h',
         'browser/prefs/pref_notifier_impl.cc',
         'browser/prefs/pref_notifier_impl.h',
         'browser/prefs/pref_service.cc',
@@ skipping 3509 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }