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Per UX advice, move fit to page checkbox into scaling section since
the two controls are related. Change behavior so that fit to page is
immediately unchecked when scaling field is modified. Also disable
print button if an invalid scaling value is currently displayed.

Bug: None
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I2b31cb1872a59effe433a19a8b526f6824328141
Reviewed-on: https://chromium-review.googlesource.com/639910
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#499092}