Quick fixes 'Create class' and 'Create constructor'

compiler/java/com/google/dart/compiler/resolver/ClassElementUnion.java

Index: compiler/java/com/google/dart/compiler/resolver/ClassElementUnion.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/ClassElementUnion.java b/compiler/java/com/google/dart/compiler/resolver/ClassElementUnion.java
index 60df2e751b9987186c77435d99793b1a64a68a27..c83745924df6931048f854fad84cd2a251782126 100644
--- a/compiler/java/com/google/dart/compiler/resolver/ClassElementUnion.java
+++ b/compiler/java/com/google/dart/compiler/resolver/ClassElementUnion.java
@@ -193,4 +193,14 @@ public class ClassElementUnion implements ClassElement {
   public List<ConstructorNodeElement> getConstructors() {
     throw new UnsupportedOperationException();
   }
+
+  @Override
+  public int getOpenBraceOffset() {
+    return -1;
+  }
+  
+  @Override
+  public int getCloseBraceOffset() {
+    return -1;
+  }
 }