Pandora: song title in tab title

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "author": "Christopher White",
  "manifest_version": 2,
  "name": "Pandora: song title in tab title",
  "version": "0.0.2",
  "description": "Show the title of the currently-playing song in the Pandora tab's title",
  "minimum_chrome_version": "49.0.0.0",
  "content_scripts": [
    {
      "matches": [
        "*://*.pandora.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "64": "assets/icon64.png",
    "128": "assets/icon128.png"
  },
  "browser_action": {
    "default_title": "Pandora song title bar",
    "default_icon": "assets/icon64.png"
  },
  "permissions": [
    "*://*.pandora.com/*"
  ]
}