[sync] Refactor how default sync datatypes are set.

chrome/browser/prefs/browser_prefs.cc

 // 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.
 
 #include "chrome/browser/prefs/browser_prefs.h"
 
 #include "chrome/browser/about_flags.h"
 #include "chrome/browser/accessibility/invert_bubble_prefs.h"
 #include "chrome/browser/autofill/autofill_manager.h"
 #include "chrome/browser/background/background_mode_manager.h"
@@ skipping 183 matching lines @@
 void RegisterUserPrefs(PrefService* user_prefs) {
   // User prefs
   AlternateErrorPageTabObserver::RegisterUserPrefs(user_prefs);
   AutofillManager::RegisterUserPrefs(user_prefs);
   bookmark_utils::RegisterUserPrefs(user_prefs);
   ChromeContentBrowserClient::RegisterUserPrefs(user_prefs);
   ChromeVersionService::RegisterUserPrefs(user_prefs);
   chrome_browser_net::HttpServerPropertiesManager::RegisterPrefs(user_prefs);
   chrome_browser_net::Predictor::RegisterUserPrefs(user_prefs);
   DownloadPrefs::RegisterUserPrefs(user_prefs);
+  extensions::ExtensionPrefs::RegisterUserPrefs(user_prefs);
   ExtensionWebUI::RegisterUserPrefs(user_prefs);
   GAIAInfoUpdateService::RegisterUserPrefs(user_prefs);
   HostContentSettingsMap::RegisterUserPrefs(user_prefs);
   IncognitoModePrefs::RegisterUserPrefs(user_prefs);
   InstantController::RegisterUserPrefs(user_prefs);
   NetPrefObserver::RegisterPrefs(user_prefs);
   NewTabUI::RegisterUserPrefs(user_prefs);
   PasswordManager::RegisterUserPrefs(user_prefs);
   PrefProxyConfigTrackerImpl::RegisterPrefs(user_prefs);
   PrefsTabHelper::RegisterUserPrefs(user_prefs);
@@ skipping 21 matching lines @@
 
 #if defined(USE_ASH)
   ash::RegisterChromeLauncherUserPrefs(user_prefs);
 #endif
 
 #if !defined(OS_ANDROID)
   CaptureVisibleTabFunction::RegisterUserPrefs(user_prefs);
   ChromeToMobileService::RegisterUserPrefs(user_prefs);
   extensions::CommandService::RegisterUserPrefs(user_prefs);
   extensions::ComponentLoader::RegisterUserPrefs(user_prefs);
-  extensions::ExtensionPrefs::RegisterUserPrefs(user_prefs);
   ExtensionSettingsHandler::RegisterUserPrefs(user_prefs);
   RegisterBrowserUserPrefs(user_prefs);
   RegisterAutolaunchPrefs(user_prefs);
   DevToolsWindow::RegisterUserPrefs(user_prefs);
   PepperFlashSettingsManager::RegisterUserPrefs(user_prefs);
   PinnedTabCodec::RegisterUserPrefs(user_prefs);
   PluginsUI::RegisterUserPrefs(user_prefs);
   SyncPromoUI::RegisterUserPrefs(user_prefs);
   printing::StickySettings::RegisterUserPrefs(user_prefs);
 #endif
@@ skipping 73 matching lines @@
     }
     local_state->ClearPref(prefs::kLastPromptedGoogleURL);
 
     current_version |= GOOGLE_URL_TRACKER_PREFS;
     local_state->SetInteger(prefs::kMultipleProfilePrefMigration,
                             current_version);
   }
 }
 
 }  // namespace chrome