The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/54de69c06c3b2ff1aed801cf3ed117339fc79ac3

commit 54de69c06c3b2ff1aed801cf3ed117339fc79ac3
Author: shrike <shrike@chromium.org>
Date: Thu Apr 14 18:49:30 2016

[Mac] Update tab audio icon to Material Design and tweak close box color.

This change allows Chrome Mac tabs to display the new Material Design vector icon for audio. It also changes the close box color (i.e. the color of the "x") from always being a light color when in an Incognito tab to being based on the theme. With Material Design on the Mac an Incognito tab will use a custom theme (if set), so a light "x" against a light custom theme is invisible.

R=avi@chromium.org, sky@chromium.org
BUG= 598777 

Review URL: https://codereview.chromium.org/1883033002

Cr-Commit-Position: refs/heads/master@{#387377}

[modify] https://crrev.com/54de69c06c3b2ff1aed801cf3ed117339fc79ac3/chrome/browser/ui/cocoa/hover_close_button.h
[modify] https://crrev.com/54de69c06c3b2ff1aed801cf3ed117339fc79ac3/chrome/browser/ui/cocoa/hover_close_button.mm
[modify] https://crrev.com/54de69c06c3b2ff1aed801cf3ed117339fc79ac3/chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.h
[modify] https://crrev.com/54de69c06c3b2ff1aed801cf3ed117339fc79ac3/chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.mm
[modify] https://crrev.com/54de69c06c3b2ff1aed801cf3ed117339fc79ac3/chrome/browser/ui/cocoa/tabs/tab_view.h
[modify] https://crrev.com/54de69c06c3b2ff1aed801cf3ed117339fc79ac3/chrome/browser/ui/cocoa/tabs/tab_view.mm
[modify] https://crrev.com/54de69c06c3b2ff1aed801cf3ed117339fc79ac3/chrome/browser/ui/tabs/tab_utils.cc