Drop author annotations from import dart-ast source code

js/js.dart-ast/src/com/google/dart/compiler/common/HasSymbol.java

@@ -4,9 +4,6 @@
 
 package com.google.dart.compiler.common;
 
-/**
- * @author johnlenz@google.com (John Lenz)
- */
 public interface HasSymbol {
   /**
    * @return Return the original user visible name for a Object represented

js/js.dart-ast/src/com/google/dart/compiler/common/Symbol.java

@@ -4,8 +4,5 @@
 
 package com.google.dart.compiler.common;
 
-/**
- * @author johnlenz@google.com (John Lenz)
- */
 public interface Symbol {
 }

js/js.dart-ast/src/com/google/dart/compiler/util/AstUtil.java

@@ -6,9 +6,6 @@ package com.google.dart.compiler.util;
 
 import com.google.dart.compiler.backend.js.ast.*;
 
-/**
- * @author johnlenz@google.com (John Lenz)
- */
 public final class AstUtil {
     private AstUtil() {
     }