Replace calls to deprecated CFX_{Wide,Byte}String::Empty()

xfa/fgas/font/fgas_stdfontmgr.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 "xfa/fgas/font/fgas_stdfontmgr.h"
 
 #include "core/fxcrt/include/fx_stream.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
@@ skipping 1362 matching lines @@
   uint16_t nNameCount = GetUInt16(sp);
   uint8_t* lpStr = lpTable + GetUInt16(sp + 2);
   for (uint16_t j = 0; j < nNameCount; j++) {
     uint16_t nNameID = GetUInt16(lpNameRecord + j * 12 + 6);
     if (nNameID != 1) {
       continue;
     }
     uint16_t nPlatformID = GetUInt16(lpNameRecord + j * 12 + 0);
     uint16_t nNameLength = GetUInt16(lpNameRecord + j * 12 + 8);
     uint16_t nNameOffset = GetUInt16(lpNameRecord + j * 12 + 10);
-    wsFamily.Empty();
+    wsFamily.clear();
     if (nPlatformID != 1) {
       for (uint16_t k = 0; k < nNameLength / 2; k++) {
         FX_WCHAR wcTemp = GetUInt16(lpStr + nNameOffset + k * 2);
         wsFamily += wcTemp;
       }
       Names.Add(wsFamily);
     } else {
       for (uint16_t k = 0; k < nNameLength; k++) {
         FX_WCHAR wcTemp = GetUInt8(lpStr + nNameOffset + k);
         wsFamily += wcTemp;
@@ skipping 109 matching lines @@
   }
 }
 int32_t CFX_FontMgrImp::IsPartName(const CFX_WideString& Name1,
                                    const CFX_WideString& Name2) {
   if (Name1.Find(Name2.c_str()) != -1) {
     return 1;
   }
   return 0;
 }
 #endif