Fix the disappearance of 'Show password' button in network configuration.

Bug: 899193
Change-Id: I282a91ea90d5cebe4353a223960712c3b3be9c73
Reviewed-on: https://chromium-review.googlesource.com/c/1308715Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Nikita Podguzov <nikitapodguzov@google.com>
Cr-Commit-Position: refs/heads/master@{#604270}

ui/webui/resources/cr_components/chromeos/network/network_password_input.html

@@ -32,7 +32,7 @@
           disabled="[[getDisabled_(disabled, property)]]"
           type="[[getInputType_(showPassword)]]" on-keypress="onInputKeypress_">
       </cr-input>
-      <template is="dom-if" if="[[!getDisabled_(disabled, property)]]" restamp>
+      <template is="dom-if" if="[[!showPolicyIndicator_]]" restamp>
         <paper-icon-button-light id="icon" slot="suffix"
             class$="[[getIconClass_(showPassword)]]">
           <button on-tap="onShowPasswordTap_"
@@ -40,7 +40,7 @@
           </button>
         </paper-icon-button-light>
       </template>
-      <template is="dom-if" if="[[getDisabled_(disabled, property)]]" restamp>
+      <template is="dom-if" if="[[showPolicyIndicator_]]" restamp>
         <cr-policy-network-indicator
             property="[[property]]" tooltip-position="left">
         </cr-policy-network-indicator>

ui/webui/resources/cr_components/chromeos/network/network_password_input.js

@@ -29,6 +29,13 @@ Polymer({
       type: Boolean,
       value: false,
     },
+
+    /** @private */
+    showPolicyIndicator_: {
+      type: Boolean,
+      value: false,
+      computed: 'getDisabled_(disabled, property)',
+    },
   },
 
   focus: function() {