Remove InputBuffer

src/scanner.h

Index: src/scanner.h
diff --git a/src/scanner.h b/src/scanner.h
index 6036833b1e4713c071a4195af1ed74955f00d9bf..0a560e37adf183db14e42c4e8ca07fb03203b167 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -430,10 +430,6 @@ class Scanner {
   // be empty).
   bool ScanRegExpFlags();
 
-  // Tells whether the buffer contains an identifier (no escapes).
-  // Used for checking if a property name is an identifier.
-  static bool IsIdentifier(unibrow::CharacterStream* buffer);
-
  private:
   // The current and look-ahead token.
   struct TokenDesc {