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Now the ContextProvider process passes data directory to the context
process as /web_context_data namespace. If the caller doesn't provide
dataDirectory then the ContextProvider start Context in incognito
mode by adding --incognito flag.

Bug: 852145
Change-Id: Id873d4334d59bac8781cb595ea836a0ace3434d4
Reviewed-on: https://chromium-review.googlesource.com/1149262Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579042}