Add Dart keyword symbols to the VM isolate

runtime/vm/scanner.h

Index: runtime/vm/scanner.h
===================================================================
--- runtime/vm/scanner.h	(revision 30276)
+++ runtime/vm/scanner.h	(working copy)
@@ -105,15 +105,12 @@
     Token::Kind kind;
     const char* keyword_chars;
     int keyword_len;
-    String* keyword_symbol;
+    const String* keyword_symbol;
   };
 
   // Rewind scanner position to token 0.
   void Reset();
 
-  // Initialize Scanner tables.
-  void InitKeywordTable();
-
   // Reads next lookahead character.
   void ReadChar();
 
@@ -216,8 +213,8 @@
   const String& private_key_;
 
   SourcePosition c0_pos_;      // Source position of lookahead character c0_.
-  KeywordTable keywords_[Token::numKeywords];
-  Array& keyword_symbol_table_;  // Access to keyword symbols in object store.
+
+  static KeywordTable keywords_[Token::numKeywords];
 };