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Now a process that creates a WebContext must pass a service_directory
handle. That directory is mounted as /svc in the context process.

Also renamed dataDirectory->data_directory, which is a proper struct
member name according to the FIDL style guide.

Bug: 869216
Change-Id: I63af58a472edf0d45b79b0108082fffcac6eaa72
Reviewed-on: https://chromium-review.googlesource.com/1157196Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580010}