Make full-form autofill the only implementation on iOS.

components/autofill/ios/browser/resources/autofill_controller.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.
 
 // Installs Autofill management functions on the |__gCrWeb| object.
 //
 // It scans the DOM, extracting and storing forms and returns a JSON string
 // representing an array of objects, each of which represents an Autofill form
 // with information about a form to be filled and/or submitted and it can be
 // translated to struct FormData
@@ skipping 119 matching lines @@
 __gCrWeb.autofill.ROLE_ATTRIBUTE_PRESENTATION = 0;
 
 /**
  * The last element that was autofilled.
  *
  * @type {Element}
  */
 __gCrWeb.autofill.lastAutoFilledElement = null;
 
 /**
- * The last element that was active (used to restore focus if necessary).
- *
- * @type {Element}
- */
-__gCrWeb.autofill.lastActiveElement = null;
-
-/**
  * Whether CSS for autofilled elements has been injected into the page.
  *
  * @type {boolean}
  */
 __gCrWeb.autofill.styleInjected = false;
 
 /**
  * Searches an element's ancestors to see if the element is inside a <form> or
  * <fieldset>.
  *
@@ skipping 392 matching lines @@
  * @return {string} A JSON encoded object with object['forms'] containing the
  *     forms data.
  */
 __gCrWeb.autofill['extractForms'] = function(requiredFields) {
   var results = new __gCrWeb.common.JSONSafeObject;
   results['forms'] = __gCrWeb.autofill.extractNewForms(requiredFields);
   return __gCrWeb.stringify(results);
 };
 
 /**
- * Stores the current active element. This is used to make the element active
- * again in case the web view loses focus when a dialog is presented over it.
- */
-__gCrWeb.autofill['storeActiveElement'] = function() {
-  __gCrWeb.autofill.lastActiveElement = document.activeElement;
-}
-
-/**
- * Clears the current active element by setting it to null.
- */
-__gCrWeb.autofill['clearActiveElement'] = function() {
-  __gCrWeb.autofill.lastActiveElement = null;
-}
-
-/**
- * Fills data into the active form field. The active form field is either
- * document.activeElement or the value of lastActiveElement if that value is
- * non-null.
+ * Fills data into the active form field.
  *
  * @param {AutofillFormFieldData} data The data to fill in.
  */
 __gCrWeb.autofill['fillActiveFormField'] = function(data) {
   var activeElement = document.activeElement;
-  if (__gCrWeb.autofill.lastActiveElement) {
-    activeElement = __gCrWeb.autofill.lastActiveElement;
-    activeElement.focus();
-    __gCrWeb.autofill.lastActiveElement = null;
-  }
   if (data['name'] !== __gCrWeb['common'].nameForAutofill(activeElement)) {
     return;
   }
   __gCrWeb.autofill.lastAutoFilledElement = activeElement;
   __gCrWeb.autofill.fillFormField(data, activeElement);
 };
 
 /**
  * Fills a number of fields in the same named form for full-form Autofill.
  * Applies Autofill CSS (i.e. yellow background) to filled elements.
@@ skipping 1487 matching lines @@
         continue;
       }
       var elementName = __gCrWeb['common'].nameForAutofill(element);
       var value = formData[elementName];
       if (value) {
         element.placeholder = value;
       }
     }
   }
 };