Cleanup: Remove Dispatcher and UserScript classes from builds where extensions are disabled.

chrome/renderer/extensions/renderer_permissions_policy_delegate.cc

Index: chrome/renderer/extensions/renderer_permissions_policy_delegate.cc
diff --git a/chrome/renderer/extensions/renderer_permissions_policy_delegate.cc b/chrome/renderer/extensions/renderer_permissions_policy_delegate.cc
index 5b52ac3f334ac6ff54a018e9b99f96457a1995ec..0e1999ddf51bc74c91b1f8ed232ae5be0104fa1c 100644
--- a/chrome/renderer/extensions/renderer_permissions_policy_delegate.cc
+++ b/chrome/renderer/extensions/renderer_permissions_policy_delegate.cc
@@ -46,11 +46,15 @@ bool RendererPermissionsPolicyDelegate::CanExecuteScriptOnPage(
     return false;
   }
 
+// TODO(thestig): Remove scaffolding once this file no longer builds with
+// extensions disabled.
+#if defined(ENABLE_EXTENSIONS)
   if (dispatcher_->IsExtensionActive(extensions::kWebStoreAppId)) {
     if (error)
       *error = errors::kCannotScriptGallery;
     return false;
   }
+#endif
 
   return true;
 }