Favicon url is used only if it is valid

ios/web/web_state/js/resources/common.js

 // Copyright 2013 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.
 
 // This file provides common methods that can be shared by other JavaScripts.
 
 goog.provide('__crWeb.common');
 
 goog.require('__crWeb.base');
 
@@ skipping 616 matching lines @@
             rel: links[i].rel.toLowerCase(),
             href: links[i].href
           };
           favicons.push(favicon);
           if (rel == 'icon' || rel == 'shortcut icon') {
             hasFavicon = true;
           }
         }
       }
     }
-    if (!hasFavicon) {
-      // If an HTTP(S)? webpage does not reference a "favicon" then search
-      // for a file named "favicon.ico" at the root of the website (legacy).
-      // http://en.wikipedia.org/wiki/Favicon
-      var location = document.location;
-      if (location.protocol == 'http:' || location.protocol == 'https:') {
-        var favicon = {
-          rel: 'icon',
-          href: location.origin + '/favicon.ico'
-        };
-        favicons.push(favicon);
-      }
-    }
     return favicons;
   };
 
   /**
    * Checks whether an <object> node is plugin content (as <object> can also be
    * used to embed images).
    * @param {HTMLElement} node The <object> node to check.
    * @return {boolean} Whether the node appears to be a plugin.
    * @private
    */
@@ skipping 50 matching lines @@
     if (plugins.length > 0) {
       // Store the list of plugins in a known place for the replacement script
       // to use, then trigger it.
       __gCrWeb['placeholderTargetPlugins'] = plugins;
       return true;
     }
     return false;
   };
 
 }());  // End of anonymous object