Move namer into javascript backend.

lib/compiler/implementation/native_handler.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.
 
 #library('native');
 #import('dart:uri');
 #import('leg.dart');
 #import('elements/elements.dart');
 #import('js_backend/js_backend.dart');
 #import('scanner/scannerlib.dart');
@@ skipping 282 matching lines @@
     builder.push(new HForeign.statement(jsCode.dartString, <HInstruction>[]));
   }
 }
 
 void generateMethodWithPrototypeCheckForElement(Compiler compiler,
                                                 StringBuffer buffer,
                                                 FunctionElement element,
                                                 String code,
                                                 String parameters) {
   String methodName;
-  Namer namer = compiler.namer;
+  JavaScriptBackend backend = compiler.backend;
+  Namer namer = backend.namer;
   if (element.kind == ElementKind.FUNCTION) {
     FunctionSignature signature = element.computeSignature(compiler);
     methodName = namer.instanceMethodName(
         element.getLibrary(), element.name, signature.parameterCount);
   } else if (element.kind == ElementKind.GETTER) {
     methodName = namer.getterName(element.getLibrary(), element.name);
   } else if (element.kind == ElementKind.SETTER) {
     methodName = namer.setterName(element.getLibrary(), element.name);
   } else {
     compiler.internalError('unexpected kind: "${element.kind}"',
@@ skipping 17 matching lines @@
                                       String parameters) {
   buffer.add("  if (Object.getPrototypeOf(this).hasOwnProperty");
   buffer.add("('$methodName')) {\n");
   buffer.add("  $code");
   buffer.add("  } else {\n");
   buffer.add("    return Object.prototype.$methodName.call(this");
   buffer.add(parameters == '' ? '' : ', $parameters');
   buffer.add(");\n");
   buffer.add("  }\n");
 }