Remove a few more char* members from structs/classes.

xfa/fxfa/parser/xfa_document_imp.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 "core/fxcrt/include/fx_ext.h"
 #include "xfa/fxfa/app/xfa_ffnotify.h"
 #include "xfa/fxfa/fm2js/xfa_fm2jsapi.h"
 #include "xfa/fxfa/parser/xfa_basic_imp.h"
@@ skipping 370 matching lines @@
   FX_POSITION pos = sUseNodes.GetStartPosition();
   while (pos) {
     CXFA_Node* pUseHrefNode = NULL;
     sUseNodes.GetNextAssoc(pos, pUseHrefNode);
     CFX_WideString wsUseVal;
     CFX_WideStringC wsURI, wsID, wsSOM;
     if (pUseHrefNode->TryCData(XFA_ATTRIBUTE_Usehref, wsUseVal) &&
         !wsUseVal.IsEmpty()) {
       FX_STRSIZE uSharpPos = wsUseVal.Find('#');
       if (uSharpPos < 0) {
-        wsURI = wsUseVal;
+        wsURI = wsUseVal.AsStringC();
       } else {
         wsURI = CFX_WideStringC(wsUseVal.c_str(), uSharpPos);
         FX_STRSIZE uLen = wsUseVal.GetLength();
         if (uLen >= uSharpPos + 5 &&
             CFX_WideStringC(wsUseVal.c_str() + uSharpPos, 5) ==
                 FX_WSTRC(L"#som(") &&
             wsUseVal[uLen - 1] == ')') {
           wsSOM = CFX_WideStringC(wsUseVal.c_str() + uSharpPos + 5,
                                   uLen - 1 - uSharpPos - 5);
         } else {
@@ skipping 29 matching lines @@
               pProtoNode)) {
         continue;
       }
     }
     if (!pProtoNode) {
       continue;
     }
     XFA_ProtoMerge_MergeNode(this, pUseHrefNode, pProtoNode);
   }
 }