Move blink platform's JSON code into a directory.

third_party/WebKit/Source/platform/json/JSONParser.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "platform/JSONParser.h"
+#include "platform/json/JSONParser.h"
 
 #include "platform/Decimal.h"
-#include "platform/JSONValues.h"
+#include "platform/json/JSONValues.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/StringToNumber.h"
 
 namespace blink {
 
 namespace {
 
 const int stackLimit = 1000;
 
 enum Token {
@@ skipping 491 matching lines @@
 std::unique_ptr<JSONValue> parseJSON(const String& json)
 {
     if (json.isEmpty())
         return nullptr;
     if (json.is8Bit())
         return parseJSONInternal(json.characters8(), json.length());
     return parseJSONInternal(json.characters16(), json.length());
 }
 
 } // namespace blink