Disable KeyboardOperations/FilesAppBrowserTest.Test/renameNewFolderDownloads_GuestMode

TBR=wjmaclean@chromium.org
NOTRY=true

Bug: 874954
Change-Id: I197eddaa975cca5edb0db359fc44c127e6d64fec
Reviewed-on: https://chromium-review.googlesource.com/1178113Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583698}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -264,7 +264,8 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
                       TestCase("renameFileDownloads"),
                       TestCase("renameFileDrive"),
                       TestCase("renameFileDrive").EnableDriveFs(),
-                      TestCase("renameNewFolderDownloads").InGuestMode(),
+                      // https://crbug.com/874954, failed on MSan bots.
+                      // TestCase("renameNewFolderDownloads").InGuestMode(),
                       TestCase("renameNewFolderDownloads"),
                       TestCase("renameNewFolderDrive"),
                       TestCase("renameNewFolderDrive").EnableDriveFs()));