title: Cannot use chrome_settings_overrides for overriding Search Provider
body: <p>I have the following declaration in my <code>manifest.json</code>, following <a href="https://developer.chrome.com/extensions/settings_override#others" rel="nofollow">Google's instructions</a>:</p>
  
  <pre><code>{
    ...
    "chrome_settings_overrides": {
      "search_provider": {
        "name": "My Name",
        "keyword": "My Keyword",
        "favicon_url": "icon32.png",
        "search_url": "http://example.com/Home/Search?keyword={searchTerms}",
        "encoding": "UTF-8",
        "is_default": true
      }
    },
    ...
  }
  </code></pre>
  
  <p>However, I cannot load the manifest with that part at all (removing it will make it work). The message is receive is:</p>
  
  <blockquote>
    <p>Failed to load extension from:
    D:\Chrome\SearchExtensions 
    Empty dictionary for 'chrome_settings_overrides'.</p>
  </blockquote>
  
  <p>What am I doing wrong? What is the proper way doing this?</p>