Change js_emitter parts into libraries

pkg/compiler/lib/src/js_emitter/parameter_stub_generator.dart

 // Copyright (c) 2015, 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.
 
-part of dart2js.js_emitter;
+library dart2js.js_emitter.parameter_stub_generator;
+
+import '../closure.dart'
+    show ClosureClassElement;
+import '../common.dart';
+import '../compiler.dart' show Compiler;
+import '../constants/values.dart';
+import '../elements/elements.dart'
+    show
+    ClassElement,
+    FunctionElement,
+    FunctionSignature,
+    MethodElement,
+    ParameterElement;
+import '../js/js.dart' as jsAst;
+import '../js/js.dart' show js;
+import '../js_backend/js_backend.dart'
+    show
+    JavaScriptBackend,
+    JavaScriptConstantCompiler,
+    Namer;
+import '../universe/call_structure.dart' show CallStructure;
+import '../universe/selector.dart' show Selector;
+import '../universe/world_builder.dart'
+    show SelectorConstraints;
+import '../world.dart' show ClosedWorld;
+
+import 'model.dart';
+
+import 'code_emitter_task.dart' show CodeEmitterTask, Emitter;
 
 class ParameterStubGenerator {
   static final Set<Selector> emptySelectorSet = new Set<Selector>();
 
   final Namer namer;
   final Compiler compiler;
   final JavaScriptBackend backend;
   final ClosedWorld closedWorld;
 
   ParameterStubGenerator(
@@ skipping 262 matching lines @@
             generateParameterStub(member, selector, null);
         if (stub != null) {
           stubs.add(stub);
         }
       }
     }
 
     return stubs;
   }
 }