Implement handling of arrow functions in the parser

src/scanner.h

Index: src/scanner.h
diff --git a/src/scanner.h b/src/scanner.h
index 8fee1b19595f3a3d54ba1d334fd2a7e56317ade6..b0838be7d040375e13a8bec2c9490e4293da8fe8 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -451,6 +451,8 @@ class Scanner {
   // be empty).
   bool ScanRegExpFlags();
 
+  bool IdentifierIsFutureStrictReserved(const AstRawString* string) const;
+
  private:
   // The current and look-ahead token.
   struct TokenDesc {
@@ -634,6 +636,7 @@ class Scanner {
   bool harmony_numeric_literals_;
 };
 
+
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_H_