Remove implicit dependencies.

dart/pkg/compiler/lib/src/compiler.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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 787 matching lines @@
   ClassElement get symbolClass => _coreTypes.symbolClass;
   ClassElement get stackTraceClass => _coreTypes.stackTraceClass;
   ClassElement get futureClass => _coreTypes.futureClass;
   ClassElement get iterableClass => _coreTypes.iterableClass;
   ClassElement get streamClass => _coreTypes.streamClass;
 
   CoreTypes get coreTypes => _coreTypes;
 
   ClassElement typedDataClass;
 
-  /// The constant for the [proxy] variable defined in dart:core.
-  ConstantValue proxyConstant;
+  /// The class for the [proxy] value defined in dart:core.
+  ClassElement proxyClass;
 
   // TODO(johnniwinther): Move this to the JavaScriptBackend.
   /// The class for patch annotation defined in dart:_js_helper.
   ClassElement patchAnnotationClass;
 
   // TODO(johnniwinther): Move this to the JavaScriptBackend.
   ClassElement nativeAnnotationClass;
 
   // Initialized after symbolClass has been resolved.
   FunctionElement symbolConstructor;
@@ skipping 504 matching lines @@
         });
         reportWarning(NO_LOCATION_SPANNABLE,
             MessageKind.IMPORT_EXPERIMENTAL_MIRRORS,
             {'importChain': importChains.join(
                  MessageKind.IMPORT_EXPERIMENTAL_MIRRORS_PADDING)});
       }
 
       functionClass.ensureResolved(this);
       functionApplyMethod = functionClass.lookupLocalMember('apply');
 
-      proxyConstant =
-          resolver.constantCompiler.compileConstant(
-              coreLibrary.find('proxy')).value;
-
       if (preserveComments) {
         return libraryLoader.loadLibrary(DART_MIRRORS)
             .then((LibraryElement libraryElement) {
           documentClass = libraryElement.find('Comment');
         });
       }
     }).then((_) => backend.onLibrariesLoaded(loadedLibraries));
   }
 
   Element findRequiredElement(LibraryElement library, String name) {
@@ skipping 48 matching lines @@
     _coreTypes.doubleClass = lookupCoreClass('double');
     _coreTypes.stringClass = lookupCoreClass('String');
     _coreTypes.functionClass = lookupCoreClass('Function');
     _coreTypes.listClass = lookupCoreClass('List');
     _coreTypes.typeClass = lookupCoreClass('Type');
     _coreTypes.mapClass = lookupCoreClass('Map');
     _coreTypes.nullClass = lookupCoreClass('Null');
     _coreTypes.stackTraceClass = lookupCoreClass('StackTrace');
     _coreTypes.iterableClass = lookupCoreClass('Iterable');
     _coreTypes.symbolClass = lookupCoreClass('Symbol');
+    proxyClass = lookupCoreClass('_Proxy');
     if (!missingCoreClasses.isEmpty) {
       internalError(
           coreLibrary,
           'dart:core library does not contain required classes: '
           '$missingCoreClasses');
     }
   }
 
   Element _unnamedListConstructor;
   Element get unnamedListConstructor {
@@ skipping 251 matching lines @@
         }
       }
     }
   }
 
   void processQueue(Enqueuer world, Element main) {
     world.nativeEnqueuer.processNativeClasses(libraryLoader.libraries);
     if (main != null && !main.isErroneous) {
       FunctionElement mainMethod = main;
       if (mainMethod.computeSignature(this).parameterCount != 0) {
-        // The first argument could be a list of strings.
-        world.registerInstantiatedClass(
-            backend.listImplementation, globalDependencies);
-        world.registerInstantiatedClass(
-            backend.stringImplementation, globalDependencies);
-
         backend.registerMainHasArguments(world);
       }
       world.addToWorkList(main);
     }
     if (verbose) {
       progress.reset();
     }
     world.forEach((WorkItem work) {
       withCurrentElement(work.element, () => work.run(this, world));
     });
@@ skipping 715 matching lines @@
     return futureClass.computeType(compiler).createInstantiation([elementType]);
   }
 
   @override
   InterfaceType streamType([DartType elementType = const DynamicType()]) {
     return streamClass.computeType(compiler).createInstantiation([elementType]);
   }
 }
 
 typedef void InternalErrorFunction(Spannable location, String message);