title: Support all google domains in a content script
body: <p>I am making a content script that does something with the google results webpage. </p>
  
  <p>The line below in the <code>manifest.json</code> is not valid. </p>
  
  <blockquote>
    <p>"matches": [ "https://www.google.*/*" ]</p>
  </blockquote>
  
  <p>The error due to above line in manifest.json is: </p>
  
  <blockquote>
    <p>Invalid value for 'content_scripts[0].matches[0]': Invalid host wildcard.</p>
  </blockquote>
  
  <p>I want to run the script on various domains like google.com, google.co.in, google.de etc. How do I accomplish that?</p>