Reduce size by emitting $.foo instead of Isolate.prototype.foo.

lib/compiler/implementation/native_emitter.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class NativeEmitter {
 
   Compiler compiler;
   StringBuffer buffer;
 
   // Classes that participate in dynamic dispatch. These are the
@@ skipping 284 matching lines @@
       buffer.add(Strings.join(entries, ','));
       buffer.add('];\n');
       buffer.add('$dynamicSetMetadataName(table);\n');
 
       buffer.add('})();\n');
     }
   }
 
   bool isSupertypeOfNativeClass(Element element) {
     if (element.isTypeVariable()) {
-      compiler.cancel("Is check for type variable", element: work.element);
+      compiler.cancel("Is check for type variable", element: element);
       return false;
     }
     if (element.computeType(compiler) is FunctionType) return false;
 
     if (!element.isClass()) {
       compiler.cancel("Is check does not handle element", element: element);
       return false;
     }
 
     return subtypes[element] !== null;
   }
 
   bool requiresNativeIsCheck(Element element) {
     if (!element.isClass()) return false;
     ClassElement cls = element;
     if (cls.isNative()) return true;
     return isSupertypeOfNativeClass(element);
   }
 
-  void emitIsChecks(StringBuffer buffer) {
+  void emitIsChecks(StringBuffer checkBuffer) {
     for (Element type in compiler.universe.isChecks) {
       if (!requiresNativeIsCheck(type)) continue;
       String name = compiler.namer.operatorIs(type);
-      buffer.add("$defPropName(Object.prototype, '$name', ");
-      buffer.add('function() { return false; });\n');
+      checkBuffer.add("$defPropName(Object.prototype, '$name', ");
+      checkBuffer.add('function() { return false; });\n');
     }
   }
 
   void assembleCode(StringBuffer targetBuffer) {
     if (nativeClasses.isEmpty()) return;
 
     // Because of native classes, we have to generate some is checks
     // by calling a method, instead of accessing a property. So we
     // attach to the JS Object prototype these methods that return
     // false, and will be overridden by subclasses when they have to
     // return true.
     StringBuffer objectProperties = new StringBuffer();
     emitIsChecks(objectProperties);
 
     // In order to have the toString method on every native class,
     // we must patch the JS Object prototype with a helper method.
     String toStringName = compiler.namer.instanceMethodName(
         null, const SourceString('toString'), 0);
     objectProperties.add("$defPropName(Object.prototype, '$toStringName', ");
     objectProperties.add(
         'function() { return $toStringHelperName(this); });\n');
 
     // Finally, emit the code in the main buffer.
     targetBuffer.add('(function() {\n$objectProperties$buffer\n})();\n');
   }
 }