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Accessible window titles in guest mode had an (Incognito) addition.
This is changed in this CL to (Guest mode).

Bug: 947933
Change-Id: Ica441beb893140218a8448e94313c0d06fe38855
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611933Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662522}