message: load webpack's chunks
diff: "content_scripts": [
  {
  "matches": ["<all_urls>"],
  - "js": ["atoms.js", "utils.js", "selenium-browserbot.js", "escape.js", "selenium-api.js", "locatorBuilders.js", "record-api.js", "record.js", "commands-api.js", "targetSelecter.js"],
  + "js": ["content.js"],
  "match_about_blank": true,
  "all_frames": true
  },
  {
  "matches": ["<all_urls>"],
  - "js": ["prompt-injecter.js"],
  + "js": ["polyfills.js", "start.js"],
  "match_about_blank": true,
  "all_frames": true,
  "run_at": "document_start"
  ],
  "background":
  {
  - "scripts": ["browser-polyfill.js", "background.js"]
  + "scripts": ["polyfills.js", "background.js"]
  }
  }
  