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

chrome/browser/resources/settings/passwords_and_forms_page/password_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/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="../icons.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="password-edit-dialog">
   <template>
@@ skipping 18 matching lines @@
       }
 
       paper-input {
         width: var(--paper-input-max-width);
       }
 
       paper-icon-button {
         --iron-icon-fill-color: var(--paper-grey-600);
       }
     </style>
-    <dialog is="cr-dialog" id="dialog" close-text="$i18n{close}"
-        on-keypress="onKeypress_">
+    <dialog is="cr-dialog" id="dialog" close-text="$i18n{close}">
       <div class="title">$i18n{passwordDetailsTitle}</div>
       <div class="body">
         <paper-input id="websiteInput" label="$i18n{editPasswordWebsiteLabel}"
             value="[[item.loginPair.originUrl]]" readonly always-float-label
             on-tap="onReadonlyInputTap_">
         </paper-input>
         <paper-input id="usernameInput" label="$i18n{editPasswordUsernameLabel}"
             value="[[item.loginPair.username]]" readonly always-float-label
             on-tap="onReadonlyInputTap_">
         </paper-input>
         <div id="passwordGroup">
           <paper-input id="passwordInput" always-float-label
               label="$i18n{editPasswordPasswordLabel}"
               type="[[getPasswordInputType_(password)]]"
               value="[[getPassword_(item, password)]]" readonly
             on-tap="onReadonlyInputTap_">
           </paper-input>
           <paper-icon-button id="showPasswordButton"
               icon="settings:visibility" on-tap="onShowPasswordButtonTap_"
               title="[[showPasswordTitle_(password,
                   '$i18nPolymer{hidePassword}','$i18nPolymer{showPassword}')]]">
           </paper-icon-button>
         </div>
       </div>
       <div class="button-container">
-        <paper-button id="actionButton" class="action-button"
-            on-tap="onActionButtonTap_">$i18n{passwordsDone}</paper-button>
+        <paper-button class="action-button" on-tap="onActionButtonTap_">
+          $i18n{passwordsDone}
+        </paper-button>
       </div>
     </dialog>
   </template>
   <script src="password_edit_dialog.js"></script>
 </dom-module>