Issue #2402 - importScripts should be governed by script-src in Web Workers. https://bugzilla.mozilla.org/show_bug.cgi?id=1322111 Add TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS content policy. Update the Cache API schema to account for new nsIContentPolicy type.

extensions/permissions/nsContentBlocker.cpp

@@ -67,6 +67,7 @@ static const char *kTypeString[] = {
                                     "", // TYPE_INTERNAL_STYLESHEET_PRELOAD
                                     "", // TYPE_INTERNAL_IMAGE_FAVICON
                                     "saveas_download",
+                                    "", // TYPE_INTERNAL_WORKERS_IMPORT_SCRIPTS
 };
 
 #define NUMBER_OF_TYPES MOZ_ARRAY_LENGTH(kTypeString)