Remove custom memory manager

core/src/fxcrt/fx_basic_utf.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"
 void CFX_UTF8Decoder::Clear()
 {
     m_Buffer.Clear();
     m_PendingBytes = 0;
 }
 void CFX_UTF8Decoder::AppendChar(FX_DWORD ch)
 {
@@ skipping 66 matching lines @@
     FXSYS_assert(pwsStr != NULL);
     if (len < 0) {
         len = (FX_STRSIZE)FXSYS_wcslen(pwsStr);
     }
     CFX_UTF8Encoder encoder;
     while (len -- > 0) {
         encoder.Input(*pwsStr ++);
     }
     return encoder.GetResult();
 }
-void FX_UTF8Encode(FX_LPCWSTR pwsStr, FX_STRSIZE len, CFX_ByteStringL &utf8Str, IFX_Allocator* pAllocator)
-{
-    FXSYS_assert(pwsStr != NULL);
-    if (len < 0) {
-        len = (FX_STRSIZE)FXSYS_wcslen(pwsStr);
-    }
-    CFX_UTF8Encoder encoder(pAllocator);
-    while (len -- > 0) {
-        encoder.Input(*pwsStr ++);
-    }
-    encoder.GetResult(utf8Str);
-}