Hardcode extensions::util::IsNewBookmarkAppsEnabled() to true, except on Mac.

chrome/browser/extensions/extension_util.cc

Index: chrome/browser/extensions/extension_util.cc
diff --git a/chrome/browser/extensions/extension_util.cc b/chrome/browser/extensions/extension_util.cc
index ba4c4704ca4749d34ab67cb7b071730c675ae23c..402ba975b09e803803717fc5abe22eb3a7ffa1b9 100644
--- a/chrome/browser/extensions/extension_util.cc
+++ b/chrome/browser/extensions/extension_util.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/extensions/shared_module_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
+#include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/sync_helper.h"
 #include "components/variations/variations_associated_data.h"
@@ -330,11 +331,9 @@ const gfx::ImageSkia& GetDefaultExtensionIcon() {
 
 bool IsNewBookmarkAppsEnabled() {
 #if defined(OS_MACOSX)
-  return base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableNewBookmarkApps);
+  return base::FeatureList::IsEnabled(features::kBookmarkApps);
 #else
-  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableNewBookmarkApps);
+  return true;
 #endif
 }