Update image and text color when row is selected in the chooser on Mac

This CL added code to change the image and text color in the chooser row
when it is selected so that it is more visible.

1. changed text from black to white when row is selected.
2. changed image from black to white when row is selected.
3. changed "Paired" text color to use gfx::kGoogleGreen300 when row is selected.

I uploaded screenshots to the issue page.

BUG=645693

Committed: https://crrev.com/188a5ae80ab8cca65c8c987a5bfb8a37e33a773e
Review-Url: https://codereview.chromium.org/2342723002
Cr-Original-Commit-Position: refs/heads/master@{#421606}
Cr-Commit-Position: refs/heads/master@{#421752}
22 files changed