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

xfa/fxfa/app/xfa_textlayout.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/fxfa/app/xfa_textlayout.h"
 
 #include <algorithm>
 
@@ skipping 499 matching lines @@
     }
   } else if (fLineHeight < 0.1f) {
     fLineHeight = GetFontSize(pTextProvider, pStyle) * 1.2f;
   }
   fLineHeight *= fVerScale;
   return fLineHeight;
 }
 FX_BOOL CXFA_TextParser::GetEmbbedObj(CXFA_TextProvider* pTextProvider,
                                       CFDE_XMLNode* pXMLNode,
                                       CFX_WideString& wsValue) {
-  wsValue.Empty();
+  wsValue.clear();
   if (pXMLNode == NULL) {
     return FALSE;
   }
   FX_BOOL bRet = FALSE;
   if (pXMLNode->GetType() == FDE_XMLNODE_Element) {
     CFDE_XMLElement* pElement = static_cast<CFDE_XMLElement*>(pXMLNode);
     CFX_WideString wsAttr;
     pElement->GetString(FX_WSTRC(L"xfa:embed").c_str(), wsAttr);
     if (wsAttr.IsEmpty()) {
       return FALSE;
     }
     if (wsAttr.GetAt(0) == L'#') {
       wsAttr.Delete(0);
     }
     CFX_WideString ws;
     pElement->GetString(FX_WSTRC(L"xfa:embedType").c_str(), ws);
     if (ws.IsEmpty()) {
       ws = L"som";
     } else {
       ws.MakeLower();
     }
     FX_BOOL bURI = (ws == FX_WSTRC(L"uri"));
     if (!bURI && ws != FX_WSTRC(L"som")) {
       return FALSE;
     }
-    ws.Empty();
+    ws.clear();
     pElement->GetString(FX_WSTRC(L"xfa:embedMode").c_str(), ws);
     if (ws.IsEmpty()) {
       ws = L"formatted";
     } else {
       ws.MakeLower();
     }
     FX_BOOL bRaw = (ws == FX_WSTRC(L"raw"));
     if (!bRaw && ws != FX_WSTRC(L"formatted")) {
       return FALSE;
     }
@@ skipping 81 matching lines @@
           eStatus = XFA_TABSTOPSSTATUS_Location;
         }
         break;
       case XFA_TABSTOPSSTATUS_Location:
         if (ch == ' ') {
           uint32_t dwHashCode = FX_HashCode_String_GetW(
               wsAlign.c_str(), wsAlign.GetLength(), TRUE);
           CXFA_Measurement ms(CFX_WideStringC(pTabStops + iLast, iCur - iLast));
           FX_FLOAT fPos = ms.ToUnit(XFA_UNIT_Pt);
           pTabstopContext->Append(dwHashCode, fPos);
-          wsAlign.Empty();
+          wsAlign.clear();
           eStatus = XFA_TABSTOPSSTATUS_None;
         }
         iCur++;
         break;
       default:
         break;
     }
   }
   if (!wsAlign.IsEmpty()) {
     uint32_t dwHashCode =
@@ skipping 222 matching lines @@
   m_pBreak->SetFontSize(fFontSize);
   m_pBreak->SetLineBreakTolerance(fFontSize * 0.2f);
   m_pBreak->SetFont(m_textParser.GetFont(m_pTextProvider, pStyle));
   m_pBreak->SetHorizontalScale(
       m_textParser.GetHorScale(m_pTextProvider, pStyle, pXMLNode));
   m_pBreak->SetVerticalScale(m_textParser.GetVerScale(m_pTextProvider, pStyle));
   m_pBreak->SetCharSpace(pParaStyle->GetLetterSpacing().GetValue());
 }
 int32_t CXFA_TextLayout::GetText(CFX_WideString& wsText) {
   GetTextDataNode();
-  wsText.Empty();
+  wsText.clear();
   if (m_bRichText) {
   } else {
     wsText = m_pTextDataNode->GetContent();
   }
   return wsText.GetLength();
 }
 FX_FLOAT CXFA_TextLayout::GetLayoutHeight() {
   if (m_pLoader == NULL) {
     return 0;
   }
@@ skipping 1088 matching lines @@
   tr.iLength = iLength;
   tr.fFontSize = pPiece->fFontSize;
   tr.iBidiLevel = pPiece->iBidiLevel;
   tr.iCharRotation = 0;
   tr.wLineBreakChar = L'\n';
   tr.iVerticalScale = pPiece->iVerScale;
   tr.dwLayoutStyles = FX_RTFLAYOUTSTYLE_ExpandTab;
   tr.iHorizontalScale = pPiece->iHorScale;
   return TRUE;
 }