Move Compiler.libraries to LibraryLoader.

pkg/dart2js_incremental/lib/caching_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.
 
 part of dart2js_incremental;
 
 /// Do not call this method directly. It will be made private.
 // TODO(ahe): Make this method private.
 Compiler reuseCompiler(
     {DiagnosticHandler diagnosticHandler,
@@ skipping 112 matching lines @@
         ..readTypeVariables.clear()
         ..instantiatedClasses = null
         ..precompiledFunction.clear()
         ..precompiledConstructorNames.clear()
         ..hasMakeConstantList = false
         ..elementDescriptors.clear();
 
     backend
         ..preMirrorsMethodCount = 0;
 
-    Map libraries = new Map.from(compiler.libraries);
-    compiler.libraries.clear();
-    compiler.libraryLoader.reset();
-    libraries.forEach((String uri, LibraryElement library) {
-      if (library.isPlatformLibrary ||
-          (packagesAreImmutable && library.isPackageLibrary)) {
-        compiler.libraries[uri] = library;
-        compiler.libraryLoader.reuseLibrary(library);
-      }
+    compiler.libraryLoader.reset(reuseLibrary: (LibraryElement library) {

[ahe, 2014/06/26 10:32:40]

This file still LGTM

+      return library.isPlatformLibrary ||
+             (packagesAreImmutable && library.isPackageLibrary);
     });
   }
   oldTag.makeCurrent();
   return compiler;
 }