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2 egtest2 are added:
1. testWhenCurrentFolderDeletedInBackground: test when the navigating
   folder of Bookmarks is deleted in background, empty background is
   shown with context bar buttons disabled.
2. testBookmarksURLDisabled: test chrome://bookmarks is disabled.

Bug: 782551
Change-Id: I1e0f4cc4960aca3094e673e812d040ec231d497c
Reviewed-on: https://chromium-review.googlesource.com/807410Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Marti Wong <martiw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521921}