Disable app list folders by default for non-ChromeOS platforms.

ui/app_list/app_list_switches.cc

Index: ui/app_list/app_list_switches.cc
diff --git a/ui/app_list/app_list_switches.cc b/ui/app_list/app_list_switches.cc
index a7e909feffdb4fddddc5537f2d80e001ba116531..c3d52d9813d230d2eceefefa3098b8d2d28bf5c6 100644
--- a/ui/app_list/app_list_switches.cc
+++ b/ui/app_list/app_list_switches.cc
@@ -25,13 +25,20 @@ const char kEnableExperimentalAppList[] = "enable-experimental-app-list";
 const char kEnableExperimentalAppListPosition[] =
     "enable-experimental-app-list-position";
 
+// If set, folders will be enabled in the app list UI.
+const char kEnableFolderUI[] = "enable-app-list-folder-ui";
+
 // If set, it will always listen to the audio locally and open the app-list
 // when the hotword is recognized.
 const char kEnableHotwordAlwaysOn[] = "enable-app-list-hotword-always-on";
 
 // Folder UI is enabled by default.
 bool IsFolderUIEnabled() {
+#if defined(OS_CHROMEOS)
   return !CommandLine::ForCurrentProcess()->HasSwitch(kDisableFolderUI);
+#else
+  return CommandLine::ForCurrentProcess()->HasSwitch(kEnableFolderUI);
+#endif
 }
 
 bool IsVoiceSearchEnabled() {