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Update the chip colors/styles to be the snowflake approved styles.  This
currently includes changing the background color, the text color and the
stroke color for chip states.

This patch also updates the padding for the chip list in downloads home
v2 to match spec.

BUG=893915

Change-Id: I7f298542cbe630f6d6b2f02f104b4b5f71f0ba85
Reviewed-on: https://chromium-review.googlesource.com/c/1278987
Commit-Queue: David Trainor <dtrainor@chromium.org>
Reviewed-by: Becky Zhou <huayinz@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600021}