Remove implicit cast from CFX_WideString to (const wchar_t*)

core/fxcrt/extension.h

 // Copyright 2014 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 CORE_FXCRT_EXTENSION_H_
 #define CORE_FXCRT_EXTENSION_H_
 
 #include <algorithm>
@@ skipping 34 matching lines @@
   }
 
   IFX_FileAccess* Retain() override {
     m_RefCount++;
     return (IFX_FileAccess*)this;
   }
 
   void GetPath(CFX_WideString& wsPath) override { wsPath = m_path; }
 
   IFX_FileStream* CreateFileStream(uint32_t dwModes) override {
-    return FX_CreateFileStream(m_path, dwModes);
+    return FX_CreateFileStream(m_path.c_str(), dwModes);
   }
 
   FX_BOOL Init(const CFX_WideStringC& wsPath) {
     m_path = wsPath;
     m_RefCount = 1;
     return TRUE;
   }
 
  protected:
   CFX_WideString m_path;
@@ skipping 259 matching lines @@
   uint32_t mt[MT_N];
 };
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 FX_BOOL FX_GenerateCryptoRandom(uint32_t* pBuffer, int32_t iCount);
 #endif
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // CORE_FXCRT_EXTENSION_H_