Revert "Make LinkedHashMap also have a factory constructor and be customizable"

pkg/analyzer_experimental/lib/src/generated/java_core.dart

 library java.core;
 
 import "dart:math" as math;
 import "dart:collection" show ListBase;
 
 class JavaSystem {
   static int currentTimeMillis() {
     return (new DateTime.now()).millisecondsSinceEpoch;
   }
 
@@ skipping 13 matching lines @@
     return false;
   }
   if (o.runtimeType == t) {
     return true;
   }
   String oTypeName = o.runtimeType.toString();
   String tTypeName = t.toString();
   if (oTypeName == tTypeName) {
     return true;
   }
+  if (oTypeName.startsWith("HashMap") && tTypeName == "Map") {
+    return true;
+  }
+  if (oTypeName.startsWith("LinkedHashMap") && tTypeName == "Map") {
+    return true;
+  }
   if (oTypeName.startsWith("List") && tTypeName == "List") {
     return true;
   }
-  if (tTypeName == "Map" && o is Map) {
-    return true;
-  }
   // Dart Analysis Engine specific
   if (oTypeName == "${tTypeName}Impl") {
     return true;
   }
   if (tTypeName == "MethodElement") {
     if (oTypeName == "MethodMember") {
       return true;
     }
   }
   if (tTypeName == "ExecutableElement") {
@@ skipping 505 matching lines @@
 abstract class Enum<E extends Enum> implements Comparable<E> {
   /// The name of this enum constant, as declared in the enum declaration.
   final String name;
   /// The position in the enum declaration.
   final int ordinal;
   Enum(this.name, this.ordinal);
   int get hashCode => ordinal;
   String toString() => name;
   int compareTo(E other) => ordinal - other.ordinal;
 }