Always use ENABLE_PLUGINS to indicate plugins support.

chrome/browser/prefs/browser_prefs.cc

 // 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.
 
 #include "chrome/browser/prefs/browser_prefs.h"
 
 #include <string>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 422 matching lines @@
   NotifierStateTracker::RegisterProfilePrefs(registry);
 #endif
 
 #if defined(ENABLE_NOTIFICATIONS) && defined(ENABLE_EXTENSIONS) && \
     !defined(OS_ANDROID)
   // The extension welcome notification requires a build that enables extensions
   // and notifications, and uses the UI message center.
   ExtensionWelcomeNotification::RegisterProfilePrefs(registry);
 #endif
 
+#if defined(ENABLE_PLUGINS)
+  PluginsUI::RegisterProfilePrefs(registry);
+#endif
+
 #if defined(ENABLE_PRINT_PREVIEW)
   printing::StickySettings::RegisterProfilePrefs(registry);
 #endif
 
 #if defined(ENABLE_SERVICE_DISCOVERY)
   LocalDiscoveryUI::RegisterProfilePrefs(registry);
 #endif
 
 #if defined(ENABLE_SUPERVISED_USERS)
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
@@ skipping 15 matching lines @@
   DevToolsWindow::RegisterProfilePrefs(registry);
   DriveAppMapping::RegisterProfilePrefs(registry);
   extensions::CommandService::RegisterProfilePrefs(registry);
   extensions::ExtensionSettingsHandler::RegisterProfilePrefs(registry);
   extensions::TabsCaptureVisibleTabFunction::RegisterProfilePrefs(registry);
   first_run::RegisterProfilePrefs(registry);
   gcm::GCMChannelStatusSyncer::RegisterProfilePrefs(registry);
   NewTabUI::RegisterProfilePrefs(registry);
   PepperFlashSettingsManager::RegisterProfilePrefs(registry);
   PinnedTabCodec::RegisterProfilePrefs(registry);
-  PluginsUI::RegisterProfilePrefs(registry);
   RegisterAutolaunchUserPrefs(registry);
   signin::RegisterProfilePrefs(registry);
 #endif
 
 #if !defined(OS_ANDROID) && !defined(OS_CHROMEOS)
   default_apps::RegisterProfilePrefs(registry);
 #endif
 
 #if defined(OS_CHROMEOS)
   chromeos::first_run::RegisterProfilePrefs(registry);
@@ skipping 79 matching lines @@
   chrome_browser_net::MigrateNetworkPredictionUserPrefs(profile_prefs);
 #endif
 
 #if defined(OS_CHROMEOS) && defined(ENABLE_APP_LIST)
   // Added 02/2015.
   MigrateGoogleNowPrefs(profile);
 #endif
 }
 
 }  // namespace chrome