isolates refactor: this change introduces 'dart:isolate' as a library. This is a

compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTestCase.java

Index: compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTestCase.java
diff --git a/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTestCase.java b/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTestCase.java
index d34a2bda20e1070f116d147711e283c29b3d89bc..be8d8a988c5b75c63910b5a297b3fa936a64abfb 100644
--- a/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTestCase.java
+++ b/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTestCase.java
@@ -93,11 +93,6 @@ public abstract class TypeAnalyzerTestCase extends TypeTestCase {
     }
 
     @Override
-    public InterfaceType getIsolateType() {
-      throw new AssertionError();
-    }
-
-    @Override
     public InterfaceType getIteratorType(Type elementType) {
       InterfaceType iteratorType = iterElement.getType();
       return iteratorType.subst(Arrays.asList(elementType), iterElement.getTypeParameters());