Remove code supporting incremental compilation in dart2js

pkg/compiler/lib/src/kernel/element_adapter.dart

Index: pkg/compiler/lib/src/kernel/element_adapter.dart
diff --git a/pkg/compiler/lib/src/kernel/element_adapter.dart b/pkg/compiler/lib/src/kernel/element_adapter.dart
index 686524c0466d609fca72ab077c03468fc78ff804..11dae99f78e8010e6121e5b8c51400552ad10393 100644
--- a/pkg/compiler/lib/src/kernel/element_adapter.dart
+++ b/pkg/compiler/lib/src/kernel/element_adapter.dart
@@ -147,7 +147,8 @@ abstract class KernelElementAdapterMixin implements KernelElementAdapter {
     }
     if (node is ir.PropertySet) return getSetterSelector(node.name);
     if (node is ir.InvocationExpression) return getInvocationSelector(node);
-    throw new SpannableAssertionFailure(CURRENT_ELEMENT_SPANNABLE,
+    throw new SpannableAssertionFailure(
+        CURRENT_ELEMENT_SPANNABLE,
         "Can only get the selector for a property get or an invocation: "
         "${node}");
   }