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Instantiate these instances when needed since the flow can be short,
especially when the intent is from Chrome, like abort on onboard screen
or failed to get scripts or do not accept the script.

Bug: 806868
Change-Id: Ib72e90a72bd8539376e54ec0a6615a14bade0568
Reviewed-on: https://chromium-review.googlesource.com/c/1430520
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Auto-Submit: Ganggui Tang <gogerald@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626144}