Remove per-tab preference machinery.

chrome/chrome_tests.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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1941 matching lines @@
         'browser/ui/gtk/tabs/tab_renderer_gtk_unittest.cc',
         'browser/ui/gtk/theme_service_gtk_unittest.cc',
         'browser/ui/intents/web_intent_picker_model_unittest.cc',
         'browser/ui/intents/web_intent_picker_unittest.cc',
         'browser/ui/intents/web_intents_model_unittest.cc',
         'browser/ui/login/login_prompt_unittest.cc',
         'browser/ui/omnibox/omnibox_view_unittest.cc',
         'browser/ui/panels/display_settings_provider_win_unittest.cc',
         'browser/ui/panels/panel_browser_window_cocoa_unittest.mm',
         'browser/ui/panels/panel_mouse_watcher_unittest.cc',
-        'browser/ui/prefs/prefs_tab_helper_unittest.cc',
         'browser/ui/search_engines/keyword_editor_controller_unittest.cc',
         'browser/ui/select_file_dialog_unittest.cc',
         'browser/ui/tabs/dock_info_unittest.cc',
         'browser/ui/tabs/tab_menu_model_unittest.cc',
         'browser/ui/tests/ui_gfx_image_unittest.cc',
         'browser/ui/tests/ui_gfx_image_unittest.mm',
         'browser/ui/toolbar/back_forward_menu_model_unittest.cc',
         'browser/ui/toolbar/encoding_menu_controller_unittest.cc',
         'browser/ui/toolbar/toolbar_model_unittest.cc',
         'browser/ui/toolbar/wrench_menu_model_unittest.cc',
@@ skipping 2621 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }