Create ast/ and parsing/ subdirectories and move appropriate files

src/parsing/json-parser.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_JSON_PARSER_H_
-#define V8_JSON_PARSER_H_
+#ifndef V8_PARSING_JSON_PARSER_H_
+#define V8_PARSING_JSON_PARSER_H_
 
 #include "src/char-predicates.h"
 #include "src/conversions.h"
 #include "src/debug/debug.h"
 #include "src/factory.h"
 #include "src/messages.h"
-#include "src/scanner.h"
-#include "src/token.h"
+#include "src/parsing/scanner.h"
+#include "src/parsing/token.h"
 #include "src/transitions.h"
 #include "src/types.h"
 
 namespace v8 {
 namespace internal {
 
 enum ParseElementResult { kElementFound, kElementNotFound, kNullHandle };
 
 
 // A simple json parser.
@@ skipping 816 matching lines @@
 
   DCHECK_EQ('"', c0_);
   // Advance past the last '"'.
   AdvanceSkipWhitespace();
   return result;
 }
 
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_JSON_PARSER_H_
+#endif  // V8_PARSING_JSON_PARSER_H_