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This CL enables autosubmit of the pac when input field is complete.
It updates the tests to ensure that they don't have to press the
submit button the first time the input field is complete.

Bug: 999389
Change-Id: I287f228de484c466df71f0a9d713d9020e2aee4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784938Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693936}