Enable gallery watches on Mac

chrome/test/data/extensions/api_test/media_galleries_private/gallerywatch/test.js

Index: chrome/test/data/extensions/api_test/media_galleries_private/gallerywatch/test.js
diff --git a/chrome/test/data/extensions/api_test/media_galleries_private/gallerywatch/test.js b/chrome/test/data/extensions/api_test/media_galleries_private/gallerywatch/test.js
index 47281bdf3437a55eb3702d73143a5ce61139d354..c28e436e1c0546864e031af89e338b5d6dad2fe7 100644
--- a/chrome/test/data/extensions/api_test/media_galleries_private/gallerywatch/test.js
+++ b/chrome/test/data/extensions/api_test/media_galleries_private/gallerywatch/test.js
@@ -33,14 +33,14 @@ var getAllGalleryWatchCallback = function (results) {
   if (results.length == 0) {
     chrome.test.sendMessage('gallery_watchers_does_not_exists');
   } else {
-    var gallery_ids_str = "";
-    for (var i = 0; i < results.length; ++i) {
-      if (gallery_ids_str != "")
-        gallery_ids_str += ", ";
-      gallery_ids_str += results[i];
+    for (var i = 0; i < results.lendth; ++i) {
+      var info = chrome.mediaGalleries.getMediaFileSystemMetadata(galleries[i]);
+      if (results[i] !== info.galleryId) {
+        chrome.test.sendMessage('gallery_watcher_mismatch');
+        return;
+      }
     }
-    chrome.test.sendMessage(
-       'watchers_for_galleries_{' + gallery_ids_str + '}_found');
+    chrome.test.sendMessage('gallery_watcher_checks');
   }
 };