Revert of [Extensions] Migrate ServiceWorker off behavior feature system

chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc

Index: chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
diff --git a/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc b/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
index 44bc83b87ec25c635862ccc51ad32a0d8d7a4c45..1f51be73a0e07940e851236a15bc613f43d772db 100644
--- a/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
+++ b/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
@@ -28,7 +28,6 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
-#include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/feature_switch.h"
 #include "extensions/common/permissions/manifest_permission_set.h"
@@ -261,9 +260,4 @@
 
 void ChromeExtensionsDispatcherDelegate::SetChannel(int channel) {
   extensions::SetCurrentChannel(static_cast<version_info::Channel>(channel));
-  if (extensions::GetCurrentChannel() == version_info::Channel::UNKNOWN) {
-    // chrome-extension: resources should be allowed to register ServiceWorkers.
-    blink::WebSecurityPolicy::registerURLSchemeAsAllowingServiceWorkers(
-        blink::WebString::fromUTF8(extensions::kExtensionScheme));
-  }
-}
+}