Network config: Use readonly instead of disabled for cr-input

Bug: 851887
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Iff73cc5d75f27932dd6a8ba9377b295be1b39b7a
Reviewed-on: https://chromium-review.googlesource.com/1105027
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568243}

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

@@ -17,7 +17,7 @@
     <!-- SSID (WiFi) -->
     <template is="dom-if" if="[[isType_(NetworkType_.WI_FI, type)]]" restamp>
       <cr-input id="ssid" label="[[i18n('OncWiFi-SSID')]]"
-          value="{{configProperties_.WiFi.SSID}}" disabled="[[hasGuid_(guid)]]">
+          value="{{configProperties_.WiFi.SSID}}" readonly="[[hasGuid_(guid)]]">
       </cr-input>
     </template>
 
@@ -46,7 +46,7 @@
           value="{{configProperties_.VPN.Host}}">
       </cr-input>
       <cr-input label="[[i18n('OncName')]]"
-          value="{{configProperties_.Name}}" disabled="[[hasGuid_(guid)]]">
+          value="{{configProperties_.Name}}" readonly="[[hasGuid_(guid)]]">
       </cr-input>
       <network-config-select id="outer" label="[[i18n('OncVPN-Type')]]"
           value="{{vpnType_}}" items="[[vpnTypeItems_]]"