dart-lang/spark — pull request #2507 by umop (2014-06-12 21:04:14+00:00)
Title: Error message with link to new harness when using old harness.

- Added the ability to parse urls in error dialogs (sanitizes all other text).
- Detect old harness via 404 error.
- Added link to [latest harness releases](https://github.com/MobileChromeApps/chrome-app-harness/releases) in error.

Fixes #2418
Review @devoncarew