switch mediaGalleries to .idl api definition

chrome/test/data/extensions/api_test/media_galleries/test.js

Index: chrome/test/data/extensions/api_test/media_galleries/test.js
diff --git a/chrome/test/data/extensions/api_test/media_gallery/test.js b/chrome/test/data/extensions/api_test/media_galleries/test.js
similarity index 81%
rename from chrome/test/data/extensions/api_test/media_gallery/test.js
rename to chrome/test/data/extensions/api_test/media_galleries/test.js
index 6302065f5d8abbbdfced24b1fb80aa76da91fd99..e9d25f937edeb14715ff56bd0c27b31a9fe9f2a1 100644
--- a/chrome/test/data/extensions/api_test/media_gallery/test.js
+++ b/chrome/test/data/extensions/api_test/media_galleries/test.js
@@ -29,20 +29,15 @@ chrome.test.runTests([
         chrome.test.callbackPass(mediaFileSystemsListCallback));
   },
 
-  function openMediaGalleryManager() {
-    // Just confirm that the function exists.
-    chrome.test.assertTrue(mediaGalleries.openMediaGalleryManager !== null);
-    chrome.test.succeed()
-  },
-
   function extractEmbeddedThumbnails() {
     var result = mediaGalleries.extractEmbeddedThumbnails({});
     chrome.test.assertEq(null, result);
-    chrome.test.succeed()
+    chrome.test.succeed();
   },
 
   function assembleMediaFile() {
     mediaGalleries.assembleMediaFile(
-        {}, {}, chrome.test.callbackPass(nullCallback));
+        new Blob, {},
+        chrome.test.callbackPass(nullCallback));
   },
 ]);