PermissionRequestCreatorApiary: fix response parsing

Also, replace the deprecated CHROME namespace with PERMISSION_CHROME_URL
(see https://cs.corp.google.com/#piper///depot/google3/google/kidsmanagement/v1/permissions_common.proto&l=30 )

BUG=

Review URL: https://codereview.chromium.org/640223002

Cr-Commit-Position: refs/heads/master@{#299898}

chrome/browser/supervised_user/permission_request_creator_apiary.cc

@@ -29,10 +29,12 @@
 using net::URLFetcher;
 
 const int kNumRetries = 1;
-const char kIdKey[] = "id";
-const char kNamespace[] = "CHROME";
+const char kNamespace[] = "PERMISSION_CHROME_URL";
 const char kState[] = "PENDING";
 
+const char kPermissionRequestKey[] = "permissionRequest";
+const char kIdKey[] = "id";
+
 static const char kAuthorizationHeaderFormat[] = "Authorization: Bearer %s";
 
 struct PermissionRequestCreatorApiary::Request {
@@ -212,8 +214,13 @@ void PermissionRequestCreatorApiary::OnURLFetchComplete(
     DispatchNetworkError(it, net::ERR_INVALID_RESPONSE);
     return;
   }
+  base::DictionaryValue* permission_dict = NULL;
+  if (!dict->GetDictionary(kPermissionRequestKey, &permission_dict)) {
+    DispatchNetworkError(it, net::ERR_INVALID_RESPONSE);
+    return;
+  }
   std::string id;
-  if (!dict->GetString(kIdKey, &id)) {
+  if (!permission_dict->GetString(kIdKey, &id)) {
     DispatchNetworkError(it, net::ERR_INVALID_RESPONSE);
     return;
   }

chrome/browser/supervised_user/permission_request_creator_apiary_unittest.cc

@@ -22,7 +22,9 @@ const char kPermissionRequestApiUrl[] = "https://myapis.com/permissions";
 
 std::string BuildResponse() {
   base::DictionaryValue dict;
-  dict.SetStringWithoutPathExpansion("id", "requestid");
+  base::DictionaryValue* permission_dict = new base::DictionaryValue;
+  permission_dict->SetStringWithoutPathExpansion("id", "requestid");
+  dict.SetWithoutPathExpansion("permissionRequest", permission_dict);
   std::string result;
   base::JSONWriter::Write(&dict, &result);
   return result;