title: Ajax call not working chrome extension with manifest v2
body: <p>I'm trying to play around with a basic chrome extension which goes something like this</p>
  
  <pre><code>chrome.omnibox.onInputChanged.addListener(function(text, suggest){
         var baseUrl = "http://sample.com";
         var finalResult = [];
                $.ajax({
                       url : baseUrl,
                       dataType : "jsonp",
                       success: function(result) {
                                       for (var i=0; i&lt;result[1].legnth; i++){
                                            finalResult.push(
                                                   {content : result[1][i], description : result[1][i]}
                                            );
                                       }
                                       suggest(finalResult);
                                },
                       async: false
                });           
  });
  </code></pre>
  
  <p>This works with manifest version 1, but when I change it to v2, I'm getting the following error. I'd appreciate any help :)</p>
  
  <p>Refused to load the script 'http://sample.com' because it violates the following Content Security Policy directive: "script-src 'self' chrome-extension-resource:".</p>