Network settings: WPAD: Show string when not provided

Bug: 804258
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I865bc4cf3fa00572775227e9b6ce455cfae57c85
Reviewed-on: https://chromium-review.googlesource.com/952464Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541455}

chrome/app/settings_strings.grdp

@@ -1438,6 +1438,9 @@
     <message name="IDS_SETTINGS_INTERNET_NETWORK_PROXY_WPAD" desc="Settings > Internet > Network details: Web Proxy Auto Discovery (WPAD) label.">
       Web Proxy Auto Discovery URL:
     </message>
+    <message name="IDS_SETTINGS_INTERNET_NETWORK_PROXY_WPAD_NONE" desc="Settings > Internet > Network details: Value for Web Proxy Auto Discovery when no URL is provided.">
+      Not provided
+    </message>
     <message name="IDS_SETTINGS_INTERNET_MOBILE_SEARCH" desc="Settings > Internet > Message in Mobile section when searching for mobile networks.">
       Searching for mobile networks
     </message>

chrome/browser/ui/webui/chromeos/network_element_localized_strings_provider.cc

@@ -246,6 +246,7 @@ void AddDetailsLocalizedStrings(content::WebUIDataSource* html_source) {
       {"networkNameserversGoogle",
        IDS_SETTINGS_INTERNET_NETWORK_NAMESERVERS_GOOGLE},
       {"networkProxyWpad", IDS_SETTINGS_INTERNET_NETWORK_PROXY_WPAD},
+      {"networkProxyWpadNone", IDS_SETTINGS_INTERNET_NETWORK_PROXY_WPAD_NONE},
   };
   for (const auto& entry : localized_strings)
     html_source->AddLocalizedString(entry.name, entry.id);

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

@@ -208,7 +208,8 @@ Polymer({
     // Set the Web Proxy Auto Discovery URL.
     var ipv4 =
         CrOnc.getIPConfigForType(this.networkProperties, CrOnc.IPType.IPV4);
-    this.WPAD_ = (ipv4 && ipv4.WebProxyAutoDiscoveryUrl) || '';
+    this.WPAD_ = (ipv4 && ipv4.WebProxyAutoDiscoveryUrl) ||
+        this.i18n('networkProxyWpadNone');
 
     this.setProxyAsync_(proxy);
   },