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When importing bookmarks from an html file with a deep
folder structure (>10k) we hit a stack overflow due to
the recursive calls in JSONWriter. Fix is to check we
do not exceed a max depth similar to JSONReader.

Bug: 1007626,355722

Change-Id: Iedd9d543b7168a08af1a325059860d79d4900661
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823809
Commit-Queue: Chris Davis <chrdavis@microsoft.com>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703999}