Bug 1317400 - Part 3: Fix devtools tests. r=till

devtools/client/inspector/markup/test/browser_markup_events_03.js

@@ -23,7 +23,7 @@ const TEST_DATA = [ // eslint-disable-line
           "Bubbling",
           "DOM2"
         ],
-        handler: "function es6Method(foo, bar) {\n" +
+        handler: "es6Method(foo, bar) {\n" +
                  "  alert(\"obj.es6Method\");\n" +
                  "}"
       }

devtools/server/tests/unit/test_listsources-04.js

@@ -29,12 +29,12 @@ function run_test_with_server(server, cb) {
     addSources(debuggee);
 
     threadClient.getSources(Task.async(function* (res) {
-      do_check_true(res.sources.length === 3, "3 sources exist");
+      do_check_eq(res.sources.length, 3, "3 sources exist");
 
       yield threadClient.reconfigure({ useSourceMaps: false });
 
       threadClient.getSources(function(res) {
-        do_check_true(res.sources.length === 1, "1 source exist");
+        do_check_eq(res.sources.length, 1, "1 source exist");
         client.close().then(cb);
       });
     }));