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This CL changes the clear (X button) in the upper right of a cr_dialog
from a paper-icon-button to a paper-icon-button-light. It also moves
some of the paper-icon-button-light styling from settings to cr CSS so
that it can apply in cr_*.

Bug: 736891
Change-Id: Idc211b5dc42d18261d5e0906fea6f5d385421f0e
Reviewed-on: https://chromium-review.googlesource.com/567728Reviewed-by: Scott Chen <scottchen@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487217}