Bug 1762683 - Fix ESLint rule warnings for no-unused-vars in...

Bug 1762683 - Fix ESLint rule warnings for no-unused-vars in intl/uconv/tests/unit/test_bug317216.js. r=Standard8

Differential Revision: https://phabricator.services.mozilla.com/D143223

.eslintrc.js

@@ -185,7 +185,6 @@ module.exports = {
         "caps/tests/unit/test_origin.js",
         "extensions/permissions/**",
         "image/test/unit/**",
-        "intl/uconv/tests/unit/test_bug317216.js",
         "intl/uconv/tests/unit/test_bug340714.js",
         "modules/libjar/test/unit/test_empty_jar_telemetry.js",
         "modules/libjar/zipwriter/test/unit/test_alignment.js",

intl/uconv/tests/unit/test_bug317216.js

@@ -86,16 +86,11 @@ const test = [
   ],
 ];
 
-const IOService = Components.Constructor(
-  "@mozilla.org/network/io-service;1",
-  "nsIIOService"
-);
 const ConverterInputStream = Components.Constructor(
   "@mozilla.org/intl/converter-input-stream;1",
   "nsIConverterInputStream",
   "init"
 );
-const ios = new IOService();
 
 function testCase(testText, expectedText, bufferLength, charset) {
   var dataURI = "data:text/plain;charset=" + charset + "," + testText;