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Changes to create the service automatically after BrowserContext is initialized.

BUG=chromium:845829
TEST=manual

Change-Id: Id1c830f0ad33c39e9dbbe676ded9d5044d1df242
Reviewed-on: https://chromium-review.googlesource.com/1068184
Commit-Queue: Roman Sorokin <rsorokin@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563577}