chromium/chrome/test/data/extensions/bad/Extensions/gggggggggggggggggggggggggggggggg/manifest.json

{
  "name": "My extension with a zero-length browser action icon",
  "version": "1.0",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "manifest_version": 2
}