GitLab

+ Change download storage permission icon to primary icon color
+ Unify download stroage permission dialog text style
+ Update icon and text color on text bubble for dark mode

Bug: 958489, 958501
Change-Id: I8a8003191a3ec28a01fd6d905997fbb0182361ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592620Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656430}