No longer register app window placement preference keys on the fly.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 849 matching lines @@
       'browser/predictors/predictor_table_base.cc',
       'browser/predictors/predictor_table_base.h',
       'browser/pref_service_flags_storage.cc',
       'browser/pref_service_flags_storage.h',
       'browser/prefetch/prefetch.cc',
       'browser/prefetch/prefetch.h',
       'browser/prefetch/prefetch_field_trial.cc',
       'browser/prefetch/prefetch_field_trial.h',
       'browser/prefs/browser_prefs.cc',
       'browser/prefs/browser_prefs.h',
+      'browser/prefs/browser_ui_prefs_migrator.cc',
+      'browser/prefs/browser_ui_prefs_migrator.h',
       'browser/prefs/chrome_pref_service_factory.cc',
       'browser/prefs/chrome_pref_service_factory.h',
       'browser/prefs/command_line_pref_store.cc',
       'browser/prefs/command_line_pref_store.h',
       'browser/prefs/incognito_mode_prefs.cc',
       'browser/prefs/incognito_mode_prefs.h',
       'browser/prefs/interceptable_pref_filter.cc',
       'browser/prefs/interceptable_pref_filter.h',
       'browser/prefs/leveldb_pref_store.cc',
       'browser/prefs/leveldb_pref_store.h',
@@ skipping 2663 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }