Switch the downloads API over to IDL/json_schema_compiler

tools/json_schema_compiler/test/idl_basics.idl

Index: tools/json_schema_compiler/test/idl_basics.idl
diff --git a/tools/json_schema_compiler/test/idl_basics.idl b/tools/json_schema_compiler/test/idl_basics.idl
index af5442ed269caf2f434703a474c7814c194334f3..39298ec999327ac583d4ef3b8c96109a3061ff6b 100644
--- a/tools/json_schema_compiler/test/idl_basics.idl
+++ b/tools/json_schema_compiler/test/idl_basics.idl
@@ -5,13 +5,15 @@
 // Tests a variety of basic API definition features.
 
 namespace idl_basics {
+  // Enum description
   enum EnumType {
     name1,
     name2
   };
 
   dictionary MyType1 {
-    long x; // This comment tests "double-quotes".
+    // This comment tests "double-quotes".
+    [legalValues=(1,2)] long x;
     DOMString y;
   };