Get rid of FX_LPCSTR cast.

core/src/fxcrt/fx_basic_buffer.cpp

 // 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
 
 #include "../../include/fxcrt/fx_basic.h"
 FX_STRSIZE FX_ftoa(FX_FLOAT f, FX_LPSTR buf);
 CFX_BinaryBuf::CFX_BinaryBuf()
     : m_AllocStep(0)
@@ skipping 353 matching lines @@
     FX_LPSTR buffer = str.GetBuffer(len);
     FXSYS_memcpy32(buffer, m_pLoadingBuf + m_LoadingPos, len);
     str.ReleaseBuffer(len);
     m_LoadingPos += len;
     return *this;
 }
 CFX_ArchiveLoader& CFX_ArchiveLoader::operator >> (CFX_WideString& str)
 {
     CFX_ByteString encoded;
     operator >> (encoded);
-    str = CFX_WideString::FromUTF16LE((const unsigned short*)(FX_LPCSTR)encoded, encoded.GetLength());
+    str = CFX_WideString::FromUTF16LE((const unsigned short*)encoded.c_str(), encoded.GetLength());
     return *this;
 }
 FX_BOOL CFX_ArchiveLoader::Read(void* pBuf, FX_DWORD dwSize)
 {
     if (m_LoadingPos + dwSize > m_LoadingSize) {
         return FALSE;
     }
     FXSYS_memcpy32(pBuf, m_pLoadingBuf + m_LoadingPos, dwSize);
     m_LoadingPos += dwSize;
     return TRUE;
@@ skipping 169 matching lines @@
 FX_BOOL CFX_FileBufferArchive::DoWork(const void* pBuf, size_t size)
 {
     if (!m_pFile) {
         return FALSE;
     }
     if (!pBuf || size < 1) {
         return TRUE;
     }
     return m_pFile->WriteBlock(pBuf, size);
 }