Prune the old deploy code. This CL does a few changes:

pkg/observe/lib/transform.dart

 // Copyright (c) 2013, 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.
 
 /**
  * Code transform for @observable. The core transformation is relatively
  * straightforward, and essentially like an editor refactoring.
  */
 library observe.transform;
 
 import 'dart:async';
-import 'package:path/path.dart' as path;
+
 import 'package:analyzer_experimental/src/generated/ast.dart';
 import 'package:analyzer_experimental/src/generated/error.dart';
 import 'package:analyzer_experimental/src/generated/parser.dart';
 import 'package:analyzer_experimental/src/generated/scanner.dart';
 import 'package:barback/barback.dart';
+import 'package:path/path.dart' as path;
 import 'package:source_maps/refactor.dart';
 import 'package:source_maps/span.dart' show SourceFile;
 
 /**
  * A [Transformer] that replaces observables based on dirty-checking with an
  * implementation based on change notifications. 
  *
  * The transformation adds hooks for field setters and notifies the observation
  * system of the change.
  */
@@ skipping 28 matching lines @@
       // dartbug.com/12340)
       printer.build(url);
       transform.addOutput(new Asset.fromString(id, printer.text));
     }));
   }
 }
 
 TextEditTransaction _transformCompilationUnit(
     String inputCode, SourceFile sourceFile, TransformLogger logger) {
   var unit = _parseCompilationUnit(inputCode);
-  return transformObservables(unit, sourceFile, inputCode, logger);
-}
-
-// TODO(sigmund): make this private. This is currently public so it can be used
-// by the polymer.dart package which is not yet entirely migrated to use
-// pub-serve and pub-deploy.
-TextEditTransaction transformObservables(CompilationUnit unit,
-    SourceFile sourceFile, String content, TransformLogger logger) {
-  var code = new TextEditTransaction(content, sourceFile);
+  var code = new TextEditTransaction(inputCode, sourceFile);
   for (var directive in unit.directives) {
     if (directive is LibraryDirective && _hasObservable(directive)) {
       logger.warning('@observable on a library no longer has any effect. '
           'It should be placed on individual fields.',
           _getSpan(sourceFile, directive));
       break;
     }
   }
 
   for (var declaration in unit.declarations) {
@@ skipping 244 matching lines @@
 $type __\$$name$initializer;
 $type get $name => __\$$name;
 set $name($type value) {
   __\$$name = notifyPropertyChange(const Symbol('$name'), __\$$name, value);
 }
 '''.replaceAll('\n', '\n$indent'));
   }
 
   code.edit(begin, end, '$replace');
 }