Re-enable BookmarkFolders test on Mac

This test was disabled due to being flaky long time ago, especially on
MacOS 10.6. It seems working fine on newer versions of Mac. So we
re-enable it.

BUG=84299

Change-Id: I1aca1edb36d6942e0ee4c7e0230e7bc76d874556
Reviewed-on: https://chromium-review.googlesource.com/c/1347276Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611506}

chrome/browser/ui/cocoa/applescript/browsercrapplication+applescript_test.mm

@@ -99,9 +99,7 @@ IN_PROC_BROWSER_TEST_F(BrowserCrApplicationAppleScriptTest, ObjectSpecifier) {
 }
 
 // Bookmark folders at the root level.
-// http://code.google.com/p/chromium/issues/detail?id=84299
-IN_PROC_BROWSER_TEST_F(BrowserCrApplicationAppleScriptTest,
-                       DISABLED_BookmarkFolders) {
+IN_PROC_BROWSER_TEST_F(BrowserCrApplicationAppleScriptTest, BookmarkFolders) {
   NSArray* bookmarkFolders = [NSApp bookmarkFolders];
   EXPECT_EQ(2U, [bookmarkFolders count]);