Remove copies of ExportNamespaceBuilder and PublicNamespaceBuilder.

pkg/analyzer/lib/src/context/context.dart

Index: pkg/analyzer/lib/src/context/context.dart
diff --git a/pkg/analyzer/lib/src/context/context.dart b/pkg/analyzer/lib/src/context/context.dart
index e931197755049bf8239ed618b04066f76a1352bb..cc1d41e3f9acc5b3b378dab14d5c1d5dfd9d2e08 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -725,7 +725,8 @@ class AnalysisContextImpl implements InternalAnalysisContext {
     LibraryElementImpl mockLib = new LibraryElementImpl.forNode(
         this, AstFactory.libraryIdentifier2(["dart.async"]));
     mockLib.definingCompilationUnit = asyncUnit;
-    mockLib.publicNamespace = new PublicNamespaceBuilder().build(mockLib);
+    mockLib.publicNamespace =
+        new NamespaceBuilder().createPublicNamespaceForLibrary(mockLib);
     return mockLib;
   }