Small cleanup: move all library private key code to Library class

runtime/vm/scanner.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Scanner class for the Dart language. The scanner reads source text
 // and produces a stream of tokens which is used by the parser.
 //
 
 #ifndef VM_SCANNER_H_
 #define VM_SCANNER_H_
@@ skipping 26 matching lines @@
   struct TokenDescriptor {
     Token::Kind kind;
     int offset;               // Offset in source string.
     SourcePosition position;  // Text position in source.
     const String* literal;    // Identifier, number or string literal.
   };
 
   // Dummy token index reflecting an unknown source position.
   static const intptr_t kNoSourcePos = 0;
 
-  // Character used to indicate a private identifier.
-  static const char kPrivateIdentifierStart  = '_';
-
-  // Character used to separate the private identifier from the key.
-  static const char kPrivateKeySeparator = '@';
-
   typedef ZoneGrowableArray<TokenDescriptor> GrowableTokenStream;
 
   // Initializes scanner to scan string source.
   Scanner(const String& source, const String& private_key);
   ~Scanner();
 
   // Scans one token at a time.
   void Scan();
 
   // Scans to specified token position.
@@ skipping 10 matching lines @@
   // Was there a line break before the current token?
   bool NewlineBeforeToken() const { return newline_seen_; }
 
   // Source code line number and column of current token.
   const SourcePosition& CurrentPosition() const {
     return current_token_.position;
   }
 
   static void InitOnce();
 
-  // Allocated a private key which is used for name mangling.
-  static RawString* AllocatePrivateKey(const Library& library);
-
   // Return true if str is an identifier.
   static bool IsIdent(const String& str);
 
   // Does the token stream contain a valid literal. This is used to implement
   // the Dart methods int.parse and double.parse.
   static bool IsValidLiteral(const Scanner::GrowableTokenStream& tokens,
                              Token::Kind literal_kind,
                              bool* is_positive,
                              const String** value);
 
@@ skipping 118 matching lines @@
 
   SourcePosition c0_pos_;      // Source position of lookahead character c0_.
 
   static KeywordTable keywords_[Token::numKeywords];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_