Remove DDC custom error list now that strong mode analyzer handles it

test/codegen_expected/matcher/matcher.js

 dart_library.library('matcher', null, /* Imports */[
   'dart_sdk'
 ], function load__matcher(exports, dart_sdk) {
   'use strict';
   const core = dart_sdk.core;
   const mirrors = dart_sdk.mirrors;
   const _interceptors = dart_sdk._interceptors;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const matcher = Object.create(null);
@@ skipping 1781 matching lines @@
         } else {
           return dart.str`${src__pretty_print._typeName(object)}:${value}`;
         }
       }
     }
     dart.fn(_prettyPrint, dynamicAndintAndSet__ToString());
     return _prettyPrint(object, 0, core.Set.new(), true);
   };
   dart.fn(src__pretty_print.prettyPrint, dynamic__ToString());
   src__pretty_print._indent = function(length) {
-    return core.List.filled(length, ' ')[dartx.join]('');
+    return ListOfString().filled(length, ' ')[dartx.join]('');
   };
   dart.fn(src__pretty_print._indent, intToString());
   src__pretty_print._typeName = function(x) {
     try {
       if (x == null) return "null";
       let type = dart.toString(dart.runtimeType(x));
       return dart.test(type[dartx.startsWith]("_")) ? "?" : type;
     } catch (e) {
       return "?";
     }
@@ skipping 187 matching lines @@
   exports.src__error_matchers = src__error_matchers;
   exports.src__interfaces = src__interfaces;
   exports.src__iterable_matchers = src__iterable_matchers;
   exports.src__map_matchers = src__map_matchers;
   exports.src__numeric_matchers = src__numeric_matchers;
   exports.src__operator_matchers = src__operator_matchers;
   exports.src__pretty_print = src__pretty_print;
   exports.src__string_matchers = src__string_matchers;
   exports.src__util = src__util;
 });