Extract a base class from CommandLinePrefStore

chrome/browser/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 823 matching lines @@
     "predictors/resource_prefetch_predictor_tab_helper.cc",
     "predictors/resource_prefetch_predictor_tab_helper.h",
     "predictors/resource_prefetch_predictor_tables.cc",
     "predictors/resource_prefetch_predictor_tables.h",
     "predictors/resource_prefetcher.cc",
     "predictors/resource_prefetcher.h",
     "predictors/resource_prefetcher_manager.cc",
     "predictors/resource_prefetcher_manager.h",
     "prefs/browser_prefs.cc",
     "prefs/browser_prefs.h",
+    "prefs/chrome_command_line_pref_store.cc",
+    "prefs/chrome_command_line_pref_store.h",
     "prefs/chrome_pref_model_associator_client.cc",
     "prefs/chrome_pref_model_associator_client.h",
     "prefs/chrome_pref_service_factory.cc",
     "prefs/chrome_pref_service_factory.h",
-    "prefs/command_line_pref_store.cc",
-    "prefs/command_line_pref_store.h",
     "prefs/incognito_mode_prefs.cc",
     "prefs/incognito_mode_prefs.h",
     "prefs/origin_trial_prefs.cc",
     "prefs/origin_trial_prefs.h",
     "prefs/pref_metrics_service.cc",
     "prefs/pref_metrics_service.h",
     "prefs/pref_service_syncable_util.cc",
     "prefs/pref_service_syncable_util.h",
     "prefs/profile_pref_store_manager.cc",
     "prefs/profile_pref_store_manager.h",
@@ skipping 488 matching lines @@
     "//components/omnibox/browser",
     "//components/os_crypt",
     "//components/packed_ct_ev_whitelist",
     "//components/password_manager/content/browser",
     "//components/password_manager/core/browser",
     "//components/password_manager/core/common",
     "//components/password_manager/sync/browser",
     "//components/policy:generated",
     "//components/policy/core/browser",
     "//components/policy/proto",
+    "//components/prefs:prefs",
     "//components/previews/core",
     "//components/profile_metrics",
     "//components/proxy_config",
     "//components/proxy_config",
     "//components/query_parser",
     "//components/rappor",
     "//components/rappor:rappor_recorder",
     "//components/renderer_context_menu",
     "//components/resources",
     "//components/safe_browsing_db",
@@ skipping 2953 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }