Bug 1403961, part 2 - Fix and enable eslint for ipc/. r=billm

After the previous patch, all that is needed to pass eslint is some
whitespace fixes I generated using:
  ./mach eslint --fix ipc

The .eslintrc.js file makes eslint expect XPCShell global variables.

With those two changes, eslint can be enabled for the ipc/ directory.

MozReview-Commit-ID: BqSICp2iV6O

.eslintignore

@@ -18,7 +18,6 @@ extensions/universalchardet/**
 gfx/**
 image/**
 intl/**
-ipc/**
 layout/**
 media/**
 memory/**

ipc/testshell/tests/.eslintrc.js

@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = {
+  "extends": [
+    "plugin:mozilla/xpcshell-test"
+  ]
+};

ipc/testshell/tests/test_ipcshell.js

@@ -18,14 +18,14 @@ function run_test() {
   sendCommand("runtime.processType;", callback);
 
   [ [ "C", "D" ], [ "D", "C" ], [ "\u010C", "D" ], [ "D", "\u010C" ] ].forEach(
-    function (pair) {
+    function(pair) {
       do_test_pending();
       var cmp = pair[0].localeCompare(pair[1]);
       sendCommand(
-          "'"+ pair[0] +"'.localeCompare('"+ pair[1] +"');",
-          function (result) {
+          "'" + pair[0] + "'.localeCompare('" + pair[1] + "');",
+          function(result) {
               do_check_eq(cmp, result);
-              do_test_finished(); 
+              do_test_finished();
           });
     })
 }

ipc/testshell/tests/test_ipcshell_child.js

@@ -1,5 +1,5 @@
-var Cc = Components.classes;
-var Ci = Components.interfaces;
+var Cc = Components.classes;
+var Ci = Components.interfaces;
 
 const runtime = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULRuntime);