Backport Bug 1442312 - Stop using deprecated-sync-thenables in DebuggerServerConnection._queueResponse

Author: jasonLaster

src/test/mochitest/browser_dbg-chrome-create.js

@@ -6,6 +6,13 @@
 /**
  * Tests that a chrome debugger can be created in a new process.
  */
+
+// There are shutdown issues for which multiple rejections are left uncaught.
+// See bug 1018184 for resolving these issues.
+const { PromiseTestUtils } = scopedCuImport("resource://testing-common/PromiseTestUtils.jsm");
+PromiseTestUtils.whitelistRejectionsGlobally(/File closed/);
+PromiseTestUtils.whitelistRejectionsGlobally(/NS_ERROR_FAILURE/);
+
 requestLongerTimeout(5);
 
 const { BrowserToolboxProcess } = ChromeUtils.import(