Type changes to make frontend work with new compiler

This is because new compiler version has new type inference, which is
more strict.

src/app/externs/backendapi.js

@@ -33,6 +33,14 @@ const backendApi = {};
  */
 backendApi.PortMapping;
 
+/**
+ * @typedef {{
+ *  key: string,
+ *  value: string
+ * }}
+ */
+backendApi.Label;
+
 /**
  * @typedef {{
  *   containerImage: string,
@@ -42,9 +50,9 @@ backendApi.PortMapping;
  *   name: string,
  *   description: ?string,
  *   portMappings: !Array<!backendApi.PortMapping>,
+ *   labels: !Array<!backendApi.Label>,
  *   replicas: number,
- *   namespace: string,
- *   labels: !Array<!backendApi.Label>
+ *   namespace: string
  * }}
  */
 backendApi.AppDeploymentSpec;
@@ -151,14 +159,6 @@ backendApi.NamespaceSpec;
  */
 backendApi.NamespaceList;
 
-/**
- * @typedef {{
- *  key: string,
- *  value: string
- * }}
- */
-backendApi.Label;
-
 /**
  * @typedef {{
  *   name: string,

src/app/frontend/deploy/deployfromsettings_controller.js

@@ -88,11 +88,17 @@ export default class DeployFromSettingsController {
      */
     this.namespaces;
 
+    /**
+     * Initialized from the scope.
+     * @export {string}
+     */
+    this.name;
+
     /**
      * Currently chosen namespace.
-     * @export {(string|undefined)}
+     * @export {string}
      */
-    this.namespace = this.namespaces.length > 0 ? this.namespaces[0] : undefined;
+    this.namespace = this.namespaces[0];
 
     /** @private {!angular.$q} */
     this.q_ = $q;