Print Preview: Fix bad alignment of text fields and buttons on OSX.
Print Preview: Fix bad alignment of text fields and buttons on OSX.

Like Windows, OSX needs more bottom-padding.
crrev.com/363594 fixed alignment issues of SELECTs and buttons. This CL fixes an
alignment issue of them and text fields.

BUG=578804

Review URL: https://codereview.chromium.org/1706373003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376674}

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