Updates dartc to recognize 'default' keyword on interface and updated factory method syntax

compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java

Index: compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
diff --git a/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java b/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
index 56e9194928f537dca77daf1f345b24325724441a..2f41b8f5e2e5e5a2d06418c177254052413e1c92 100644
--- a/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
+++ b/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
@@ -53,9 +53,9 @@ public abstract class SnippetTestCase extends CompilerTestCase {
     lib.addSource(src);
     CompilerOptions options = new CompilerOptions();
     CompilerConfiguration config = new DefaultCompilerConfiguration(this.getBackend(), options);
-    DartCompilerListener listener = new DartCompilerListenerTest(src.getName());
+    DartCompilerListenerTest listener = new DartCompilerListenerTest(src.getName());
     DartCompiler.compileLib(lib, config, provider, listener);
-
+    listener.checkAllErrorsReported();
     return provider.getArtifactString(src, part, JavascriptBackend.EXTENSION_JS);
   }