Accessibility: Fix color enhancer filtering

ui/accessibility/extensions/colorenhancer/src/background.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Adds filter script and css to all existing tabs.
  *
  * TODO(wnwen): Verify content scripts are not being injected multiple times.
  */
 function injectContentScripts() {
   chrome.windows.getAll({'populate': true}, function(windows) {
     for (var i = 0; i < windows.length; i++) {
       var tabs = windows[i].tabs;
       for (var j = 0; j < tabs.length; j++) {
         var url = tabs[j].url;
         if (isDisallowedUrl(url)) {
           continue;
         }
-        chrome.tabs.insertCSS(
-            tabs[j].id,
-            {file: 'res/cvd.css'});
         chrome.tabs.executeScript(
             tabs[j].id,
             {file: 'src/common.js'});
         chrome.tabs.executeScript(
             tabs[j].id,
             {file: 'src/cvd.js'});
       }
     }
   });
 }
@@ skipping 50 matching lines @@
           sendResponse(msg);
         }
       });
 
   //TODO(mustaq): Handle uninstall
 
   document.addEventListener('storage', function(evt) {
     updateTabs();
   }, false);
 })();