Standardize and patch regression in ':selected' colors

A previous CL https://chromium-review.googlesource.com/1131016
accidentally rewrote CSS rules for some instances of the
':selected' pseudo class.

This CL sets ':selected' UI to use the '@theme_selected_fg_color' and
'@theme_selected_bg_color' colors (unless the UI has the ':disabled'
pseudo class).

This CL used the following rewrites in the CSS rewriting tool.

    Mod(r'.*:selected',
        anti=[r':disabled'],
        remove=color(),
        replace=r'\1@theme_selected_fg_color\3')
    Mod(r'.*:selected',
        anti=[r':disabled'],
        remove=background_color(),
        replace=r'\1@theme_selected_bg_color\3')

Change-Id: If022ff8a82619fe302ac49666a85176c0807b174
Bug: 822495
Reviewed-on: https://chromium-review.googlesource.com/1147881
Commit-Ready: Josh Pratt <jopra@chromium.org>
Tested-by: Josh Pratt <jopra@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
2 files changed