Revert "Move Compiler.libraries to LibraryLoder."

tests/compiler/dart2js/memory_compiler.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.
 
 library dart2js.test.memory_compiler;
 
 import 'memory_source_file_helper.dart';
 
 import 'package:compiler/implementation/dart2jslib.dart'
        show NullSink;
@@ skipping 146 matching lines @@
   }
 
   Compiler compiler = new Compiler(readStringFromUri,
                                    outputProvider,
                                    handler,
                                    libraryRoot,
                                    packageRoot,
                                    options,
                                    {});
   if (cachedCompiler != null) {
-    compiler.coreLibrary =
-        cachedCompiler.libraryLoader.lookupLibrary(Uri.parse('dart:core'));
+    compiler.coreLibrary = cachedCompiler.libraries['dart:core'];
     compiler.types = cachedCompiler.types.copy(compiler);
     Map copiedLibraries = {};
-    cachedCompiler.libraryLoader.libraries.forEach((library) {
+    cachedCompiler.libraries.forEach((String uri, library) {
       if (library.isPlatformLibrary) {
-        compiler.libraryLoader.mapLibrary(library);
         compiler.onLibraryCreated(library);
+        compiler.libraries[uri] = library;
+        // TODO(johnniwinther): Assert that no libraries are created lazily from
+        // this call.
         compiler.onLibraryScanned(library, null);
         if (library.isPatched) {
           var patchLibrary = library.patch;
           compiler.onLibraryCreated(patchLibrary);
+          // TODO(johnniwinther): Assert that no libraries are created lazily
+          // from this call.
           compiler.onLibraryScanned(patchLibrary, null);
         }
         copiedLibraries[library.canonicalUri] = library;
       }
     });
     // TODO(johnniwinther): Assert that no libraries are loaded lazily from
     // this call.
     compiler.onLibrariesLoaded(copiedLibraries);
 
     compiler.symbolConstructor = cachedCompiler.symbolConstructor;
@@ skipping 56 matching lines @@
       createDiagnosticHandler(diagnosticHandler, provider, showDiagnostics);
 
   List<Uri> libraries = <Uri>[];
   memorySourceFiles.forEach((String path, _) {
     libraries.add(new Uri(scheme: 'memory', path: path));
   });
 
   return analyze(libraries, libraryRoot, packageRoot,
                  provider, handler, options);
 }