Update comments in core lib showing proper factory syntax.

runtime/vm/parser.h

Index: runtime/vm/parser.h
===================================================================
--- runtime/vm/parser.h	(revision 1677)
+++ runtime/vm/parser.h	(working copy)
@@ -68,8 +68,6 @@
 
 class Parser : ValueObject {
  public:
-  static const int kErrorBuflen = 512;
-
   Parser(const Script& script, const Library& library);
   Parser(const Script& script,
          const Function& function,
@@ -82,11 +80,15 @@
 
   static void ParseFunction(ParsedFunction* parsed_function);
 
-  static void ReportMsg(const Script& script,
-                        intptr_t token_index,
-                        const char* msg_type,
-                        char* message,
-                        const char* format, va_list args);
+  // Format an error or warning message into the message_buffer.
+  // A null script means no source and a negative token_index means no position.
+  static void FormatMessage(const Script& script,
+                            intptr_t token_index,
+                            const char* message_header,
+                            char* message_buffer,
+                            intptr_t message_buffer_size,
+                            const char* format,
+                            va_list args);
 
  private:
   struct Block;
@@ -442,8 +444,6 @@
   // done using 'return', 'break' or 'continue' statements.
   TryBlocks* try_blocks_list_;
 
-  char error_msg_[kErrorBuflen];
-
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };