Bug 1314829: Remove no-unused-expressions from the recommended configuration. r=jaws DONTBUILD

MozReview-Commit-ID: C3jvF2aFNsx

--HG--
extra : rebase_source : db42159a239caaea82b4c1f27bb6b2a44321f47e
extra : amend_source : dc92e1877d4f7dc5f93435bf8c4b5599e584e509

toolkit/.eslintrc.js

@@ -153,9 +153,6 @@ module.exports = {
     // No unreachable statements
     // "no-unreachable": 2,
 
-    // No expressions where a statement is expected
-    // "no-unused-expressions": 2,
-
     // No declaring variables that are never used
     // "no-unused-vars": [2, {"vars": "all", "args": "none"}],