Re-Enable babel-stepping test with the appropriate step positions (firefox-devtools#5594)

Author: jasonLaster

src/test/mochitest/browser.ini

@@ -123,7 +123,6 @@ support-files =
 [browser_dbg-async-stepping.js]
 [browser_dbg-babel-scopes.js]
 [browser_dbg-babel-stepping.js]
-skip-if = true
 [browser_dbg-breaking.js]
 [browser_dbg-breaking-from-console.js]
 [browser_dbg-breakpoints.js]

src/test/mochitest/browser_dbg-babel-stepping.js

@@ -113,8 +113,6 @@ function testStepOveForOfClosure(dbg) {
     "step-over-for-of-closure",
     { line: 6, column: 2 },
     [
-      ["stepOver", { line: 8, column: 2 }],
-      ["stepOver", { line: 8, column: 2 }],
       ["stepOver", { line: 8, column: 2 }],
       ["stepOver", { line: 12, column: 2 }]
     ]