Re-enable FolderShortcuts and Traverse FileManagerBrowserTests

Enabled in RELEASE. Run these tests again on remaining chrome-os bots:
DEBUG/MSAN/ASAN.

  FolderShortcuts/FileManagerBrowserTest.Test*
  Traverse/FileManagerBrowserTest.Test*

Tbr: slangley
Bug: 836254
Change-Id: I901cd286fdc25147e17656bb54e423756c2486f9
Reviewed-on: https://chromium-review.googlesource.com/1025499Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553147}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -323,13 +323,8 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
                       TestParameter(NOT_IN_GUEST_MODE,
                                     "restoreGeometryMaximizedState")));
 
-#if defined(DISABLE_SLOW_FILESAPP_TESTS)
-#define MAYBE_Traverse DISABLED_Traverse
-#else
-#define MAYBE_Traverse Traverse
-#endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
-    MAYBE_Traverse,
+    Traverse,
     FileManagerBrowserTest,
     ::testing::Values(TestParameter(IN_GUEST_MODE, "traverseDownloads"),
                       TestParameter(NOT_IN_GUEST_MODE, "traverseDownloads"),
@@ -394,13 +389,8 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
         TestParameter(NOT_IN_GUEST_MODE, "genericTaskIsNotExecuted"),
         TestParameter(NOT_IN_GUEST_MODE, "genericAndNonGenericTasksAreMixed")));
 
-#if defined(DISABLE_SLOW_FILESAPP_TESTS)
-#define MAYBE_FolderShortcuts DISABLED_FolderShortcuts
-#else
-#define MAYBE_FolderShortcuts FolderShortcuts
-#endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
-    MAYBE_FolderShortcuts,
+    FolderShortcuts,
     FileManagerBrowserTest,
     ::testing::Values(
         TestParameter(NOT_IN_GUEST_MODE, "traverseFolderShortcuts"),