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Previously we tint icon mixing with original color in dark mode, this
CL will throw out the original color and tint the icons.

Bug: 1126477
Change-Id: Ie9f96f9387a0084004684036dd842465171d442d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404440Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Gang Wu <gangwu@chromium.org>
Commit-Queue: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805899}