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Improves the clarity of the codebase, as the AutomationManager's primary
responsibility is to handle navigation around the page.

Bug: None
Change-Id: I897cbab60abdd081a6cb687476c57ff294f9e127
Reviewed-on: https://chromium-review.googlesource.com/c/1294516Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Zach Helfinstein <zhelfins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601793}