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The color of active icons should be Grey 200, which is darker than the
labels by 1 level.
This will affect multiple places including:
- tray collapse button
- feature pod icons
- top shortcut buttons
- slider button
- menu back arrow icon
- ink drop of sign out button
- tray popup

Bug: 853695
Change-Id: Ifbbfe221db040f2f02d9577a636b7c7dd4f796f0
Reviewed-on: https://chromium-review.googlesource.com/1180787Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585363}