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- Styling wrapper for diagnostic cards
- No styling is applied yet

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I21df9d3311aa54f8a21ef1f501a517c3e1a22e1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2403901Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805979}