Recompile unit with potential conflict/dependency on some top-level symbol.

compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java

Index: compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java
diff --git a/compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java b/compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java
index 93482d41c0b41473b411df8b62a4b75b6cfc0af4..319c8955563914ed089199906268a977c8dab00b 100644
--- a/compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java
+++ b/compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java
@@ -116,4 +116,9 @@ public enum ParserErrorCode implements ErrorCode {
   public SubSystem getSubSystem() {
     return SubSystem.PARSER;
   }
+
+  @Override
+  public boolean needsRecompilation() {
+    return true;
+  }
 }