Make CFX_WideString(const CFX_WideString&) explicit.

xfa/fxfa/parser/xfa_layout_pagemgr_new.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/parser/xfa_layout_pagemgr_new.h"
 
 #include "xfa/fxfa/app/xfa_ffnotify.h"
 #include "xfa/fxfa/fm2js/xfa_fm2jsapi.h"
@@ skipping 256 matching lines @@
   }
   return XFA_LAYOUT_FLOAT_MAX;
 }
 static CXFA_Node* XFA_ResolveBreakTarget(CXFA_Node* pPageSetRoot,
                                          FX_BOOL bNewExprStyle,
                                          CFX_WideStringC& wsTargetExpr) {
   CXFA_Document* pDocument = pPageSetRoot->GetDocument();
   if (wsTargetExpr.IsEmpty()) {
     return NULL;
   }
-  CFX_WideString wsTargetAll = wsTargetExpr;
+  CFX_WideString wsTargetAll(wsTargetExpr);
   wsTargetAll.TrimLeft();
   wsTargetAll.TrimRight();
   int32_t iSpliteIndex = 0;
   FX_BOOL bTargetAllFind = TRUE;
   while (iSpliteIndex != -1) {
     CFX_WideString wsTargetExpr;
     int32_t iSpliteNextIndex = 0;
     if (!bTargetAllFind) {
       iSpliteNextIndex = wsTargetAll.Find(' ', iSpliteIndex);
       wsTargetExpr =
@@ skipping 1629 matching lines @@
   }
   pRootLayoutItem = m_pPageSetLayoutItemRoot;
   CXFA_ContainerLayoutItem* pNextLayout = NULL;
   for (; pRootLayoutItem; pRootLayoutItem = pNextLayout) {
     pNextLayout = (CXFA_ContainerLayoutItem*)pRootLayoutItem->m_pNextSibling;
     SaveLayoutItem(pRootLayoutItem);
     delete pRootLayoutItem;
   }
   m_pPageSetLayoutItemRoot = NULL;
 }