Don't allow new of interface without constructors.

compiler/javatests/com/google/dart/compiler/resolver/ResolverTest.java

Index: compiler/javatests/com/google/dart/compiler/resolver/ResolverTest.java
diff --git a/compiler/javatests/com/google/dart/compiler/resolver/ResolverTest.java b/compiler/javatests/com/google/dart/compiler/resolver/ResolverTest.java
index 5ce4d3691657b0bc64b0cee307bb1852e9d23007..c805912292fa821c0f636b8b515d0a98ae216503 100644
--- a/compiler/javatests/com/google/dart/compiler/resolver/ResolverTest.java
+++ b/compiler/javatests/com/google/dart/compiler/resolver/ResolverTest.java
@@ -217,6 +217,19 @@ public class ResolverTest extends ResolverTestCase {
      */
   }
 
+  public void testImplicitDefaultConstructor_OnInterfaceWithoutFactory() {
+    // Check that the implicit constructor is resolved correctly
+    resolveAndTest(Joiner.on("\n").join(
+        "class Object {}",
+        "interface B {}",
+        "class C { main() { new B(); } }"),
+        ResolverErrorCode.NEW_EXPRESSION_NOT_CONSTRUCTOR);
+
+    /*
+     * We should check for signature mismatch but that is a TypeAnalyzer issue.
+     */
+  }
+  
   public void testImplicitDefaultConstructor_ThroughFactories() {
     // Check that we generate implicit constructors through factories also.
     resolveAndTest(Joiner.on("\n").join(