Convert garden-o-matic guts over to promises where appropriate

Tools/GardeningServer/scripts/garden-o-matic.js

Index: Tools/GardeningServer/scripts/garden-o-matic.js
diff --git a/Tools/GardeningServer/scripts/garden-o-matic.js b/Tools/GardeningServer/scripts/garden-o-matic.js
index 7d8ccecd7f43cf1e1de262b8ab3811af45142c14..0b60f5d4096be5782612d06451e4820306dbb73a 100644
--- a/Tools/GardeningServer/scripts/garden-o-matic.js
+++ b/Tools/GardeningServer/scripts/garden-o-matic.js
@@ -78,12 +78,12 @@ function update()
 
     g_info.add(updating);
 
-    builders.buildersFailingNonLayoutTests(function(failuresList) {
+    builders.buildersFailingNonLayoutTests().then(function(failuresList) {
         g_nonLayoutTestFailureBuilders.update(failuresList);
         updatePartyTime();
     });
 
-    base.callInParallel([model.updateRecentCommits, model.updateResultsByBuilder], function() {
+    Promise.all([model.updateRecentCommits(), model.updateResultsByBuilder()]).then(function() {
         if (g_failuresController)
             g_failuresController.update();
 
@@ -92,7 +92,7 @@ function update()
         model.analyzeUnexpectedFailures(function(failureAnalysis) {
             updating.update('Analyzing test failures ... ' + ++numberOfTestsAnalyzed + ' tests analyzed.');
             g_unexpectedFailuresController.update(failureAnalysis);
-        }, function() {
+        }).then(function() {
             updatePartyTime();
             g_unexpectedFailuresController.purge();