Rename fxjse/ to fxjs/ update files to match class names.

fxjs/include/cfxjse_arguments.h

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#ifndef FXJSE_INCLUDE_CFXJSE_ARGUMENTS_H_
-#define FXJSE_INCLUDE_CFXJSE_ARGUMENTS_H_
+#ifndef FXJS_INCLUDE_CFXJSE_ARGUMENTS_H_
+#define FXJS_INCLUDE_CFXJSE_ARGUMENTS_H_
 
 #include <memory>
 
-#include "fxjse/include/fxjse.h"
+#include "fxjs/include/fxjse.h"
 
 class CFXJSE_Class;
 
 class CFXJSE_Arguments {
  public:
   CFXJSE_Arguments(const v8::FunctionCallbackInfo<v8::Value>* pInfo,
                    CFXJSE_Value* pRetValue)
       : m_pInfo(pInfo), m_pRetValue(pRetValue) {}
 
   v8::Isolate* GetRuntime() const;
   int32_t GetLength() const;
   std::unique_ptr<CFXJSE_Value> GetValue(int32_t index) const;
   FX_BOOL GetBoolean(int32_t index) const;
   int32_t GetInt32(int32_t index) const;
   FX_FLOAT GetFloat(int32_t index) const;
   CFX_ByteString GetUTF8String(int32_t index) const;
   CFXJSE_HostObject* GetObject(int32_t index,
                                CFXJSE_Class* pClass = nullptr) const;
   CFXJSE_Value* GetReturnValue();
 
  private:
   const v8::FunctionCallbackInfo<v8::Value>* m_pInfo;
   CFXJSE_Value* m_pRetValue;
 };
 
-#endif  // FXJSE_INCLUDE_CFXJSE_ARGUMENTS_H_
+#endif  // FXJS_INCLUDE_CFXJSE_ARGUMENTS_H_