Issue 5052. Analyzer should treat assert as a keyword

compiler/java/com/google/dart/compiler/ast/ASTVisitor.java

Index: compiler/java/com/google/dart/compiler/ast/ASTVisitor.java
diff --git a/compiler/java/com/google/dart/compiler/ast/ASTVisitor.java b/compiler/java/com/google/dart/compiler/ast/ASTVisitor.java
index 9f082aa190f90a3ccba4c414aae96d19a2f50f63..5241ff2afd1e30bc79a250f2fe0021a80fc90d56 100644
--- a/compiler/java/com/google/dart/compiler/ast/ASTVisitor.java
+++ b/compiler/java/com/google/dart/compiler/ast/ASTVisitor.java
@@ -113,6 +113,10 @@ public class ASTVisitor<R> {
     return visitLiteral(node);
   }
 
+  public R visitAssertStatement(DartAssertStatement node) {
+    return visitStatement(node);
+  }
+  
   public R visitBreakStatement(DartBreakStatement node) {
     return visitGotoStatement(node);
   }