[Research] OUI Compliance audit of src/core/public/chrome

[BSFishy]

Tracking issue for OUI compliance audit of the src/core/public/chrome folder.

Follow the steps in #3945 to complete the audit, then open another issue with findings. Once the work of performing the audit is done, this issue can be closed.

Note that this is a core service, which may be involved with the implementation and inclusion of OUI styles and themes. Since this is a core service, the conclusion of this audit might actually not involve any additional work.

Related files

size (bytes)	file	notes
2.4K	src/core/public/chrome/ui/header/header_breadcrumbs.scss
463	src/core/public/chrome/ui/header/_index.scss
384	src/core/public/chrome/ui/header/home_loader.scss
122	src/core/public/chrome/ui/header/collapsible_nav.scss
115	src/core/public/chrome/ui/header/header_logo.scss
86	src/core/public/chrome/ui/_loading_indicator.scss
57	src/core/public/chrome/ui/_index.scss
22	src/core/public/chrome/_index.scss

If this issue isn't already assigned to someone and you'd like to take on this work, please ping @BSFishy in the comments and I can assign it to you.