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* Error and warning icon use was reversed from Material guidelines,
  other Chrome use, etc.  Swap these to fix.
* "Warning" icon + "normal" color doesn't make sense; use the warning
  color there.
* Apply the same styling to the filename in |file_name_label_| as in the
  other labels.  This only has a visible effect when new-style warnings
  are enabled.
* Schedule a paint when |complete_animation_| ends, too, not just when
  it progresses; this ensures the download item doesn't get "stuck until
  mouseover" when canceling, for example.

Bug: none
Change-Id: Icffc49980c23c3b42133c5c54af195924b33084c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333658
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795386}