Backed out changeset aba9324719be (bug 863246)

dom/workers/ScriptLoader.cpp

@@ -894,19 +894,10 @@ private:
   {
     AssertIsOnMainThread();
     MOZ_ASSERT(aIndex < mLoadInfos.Length());
-    MOZ_ASSERT_IF(IsMainWorkerScript(), mWorkerScriptType != DebuggerScript);
 
     WorkerPrivate* parentWorker = mWorkerPrivate->GetParent();
 
-    // For JavaScript debugging, the devtools server must run on the same
-    // thread as the debuggee, indicating the worker uses content principal.
-    // However, in Bug 863246, web content will no longer be able to load
-    // resource:// URIs by default, so we need system principal to load
-    // debugger scripts.
-    nsIPrincipal* principal = (mWorkerScriptType == DebuggerScript) ?
-                              nsContentUtils::GetSystemPrincipal() :
-                              mWorkerPrivate->GetPrincipal();
-
+    nsIPrincipal* principal = mWorkerPrivate->GetPrincipal();
     nsCOMPtr<nsILoadGroup> loadGroup = mWorkerPrivate->GetLoadGroup();
     MOZ_DIAGNOSTIC_ASSERT(principal);