Promote class to a reserved word

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

Index: compiler/java/com/google/dart/compiler/parser/DartParser.java
diff --git a/compiler/java/com/google/dart/compiler/parser/DartParser.java b/compiler/java/com/google/dart/compiler/parser/DartParser.java
index 85e54bf233d968aeb3ba567714bd926568e0b44c..c5ef614420759d7f88ecfab8e0383d7533c3518a 100644
--- a/compiler/java/com/google/dart/compiler/parser/DartParser.java
+++ b/compiler/java/com/google/dart/compiler/parser/DartParser.java
@@ -123,7 +123,6 @@ public class DartParser extends CompletionHooksParserBase {
   // Pseudo-keywords that should also be valid identifiers.
   private static final String ABSTRACT_KEYWORD = "abstract";
   private static final String ASSERT_KEYWORD = "assert";
-  private static final String CLASS_KEYWORD = "class";
   private static final String EXTENDS_KEYWORD = "extends";
   private static final String FACTORY_KEYWORD = "factory";
   private static final String GETTER_KEYWORD = "get";
@@ -140,7 +139,6 @@ public class DartParser extends CompletionHooksParserBase {
   public static final String[] PSEUDO_KEYWORDS = {
     ABSTRACT_KEYWORD,
     ASSERT_KEYWORD,
-    CLASS_KEYWORD,
     EXTENDS_KEYWORD,
     FACTORY_KEYWORD,
     GETTER_KEYWORD,
@@ -260,7 +258,7 @@ public class DartParser extends CompletionHooksParserBase {
           isParsingAbstract = true;
         }
         // Parse top level element.
-        if (optionalPseudoKeyword(CLASS_KEYWORD)) {
+        if (optional(Token.CLASS)) {
           node = done(parseClass());
         } else if (optionalPseudoKeyword(INTERFACE_KEYWORD)) {
           isParsingInterface = true;
@@ -295,7 +293,7 @@ public class DartParser extends CompletionHooksParserBase {
    *         level.
    */
   private boolean peekTopLevelKeyword(int n) {
-    return peekPseudoKeyword(n, CLASS_KEYWORD)
+    return peek(n) == Token.CLASS
         || peekPseudoKeyword(n, INTERFACE_KEYWORD)
         || peekPseudoKeyword(n, TYPEDEF_KEYWORD);
   }