WebUI: For cr-dialog, handle Enter keys in paper-inputs.

chrome/browser/resources/settings/passwords_and_forms_page/credit_card_edit_dialog.html

 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/md_select_css.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/iron-a11y-keys/iron-a11y-keys.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="../settings_vars_css.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="settings-credit-card-edit-dialog">
   <style include="settings-shared md-select">
     paper-input {
       width: var(--paper-input-max-width);
     }
@@ skipping 23 matching lines @@
     label {
       color: var(--light-theme-secondary-color);
       display: block;
       padding-top: 8px;
     }
   </style>
   <template>
     <dialog is="cr-dialog" id="dialog" close-text="$i18n{close}">
       <div class="title">[[title_]]</div>
       <div class="body">
-        <div>
-          <iron-a11y-keys keys="enter" on-keys-pressed="onSaveButtonTap_">
-          </iron-a11y-keys>
-          <paper-input id="nameInput" label="$i18n{creditCardName}"
-              value="{{creditCard.name}}" always-float-label autofocus
-              on-input="onCreditCardNameOrNumberChanged_">
-          </paper-input>
-          <paper-input id="numberInput" label="$i18n{creditCardNumber}"
-              value="{{creditCard.cardNumber}}" always-float-label
-              on-input="onCreditCardNameOrNumberChanged_">
-          </paper-input>
-        </div>
+        <paper-input id="nameInput" label="$i18n{creditCardName}"
+            value="{{creditCard.name}}" always-float-label autofocus
+            on-input="onCreditCardNameOrNumberChanged_">
+        </paper-input>
+        <paper-input id="numberInput" label="$i18n{creditCardNumber}"
+            value="{{creditCard.cardNumber}}" always-float-label
+            on-input="onCreditCardNameOrNumberChanged_">
+        </paper-input>
         <label>$i18n{creditCardExpiration}</label>
         <span class="md-select-wrapper">
           <select class="md-select" id="month" value="[[expirationMonth_]]"
               on-change="onMonthChange_">
             <template is="dom-repeat" items="[[monthList_]]">
               <option>[[item]]</option>
             </template>
           </select>
           <span class="md-select-underline"></span>
         </span>
@@ skipping 13 matching lines @@
       <div class="button-container">
         <paper-button id="cancelButton" class="cancel-button"
             on-tap="onCancelButtonTap_">$i18n{cancel}</paper-button>
         <paper-button id="saveButton" class="action-button"
             on-tap="onSaveButtonTap_" disabled>$i18n{save}</paper-button>
       </div>
     </dialog>
   </template>
   <script src="credit_card_edit_dialog.js"></script>
 </dom-module>