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 c60bf7e702382fa5dd076959a8ae639bd7b57dda..74e6dff177a286aa1893d25a6ea1828e410d431e 100644
--- a/compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java
+++ b/compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java
@@ -115,4 +115,9 @@ public enum ParserErrorCode implements ErrorCode {
   public SubSystem getSubSystem() {
     return SubSystem.PARSER;
   }
+
+  @Override
+  public boolean needsRecompilation() {
+    return true;
+  }
 }