Remove some c_str() calls from StringCs in xfa docs.

xfa/fxfa/app/xfa_fftext.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_fftext.h"
 
 #include "xfa/fwl/core/fwl_widgetdef.h"
 #include "xfa/fxfa/app/xfa_ffdraw.h"
@@ skipping 118 matching lines @@
 FX_BOOL CXFA_FFText::OnLButtonUp(uint32_t dwFlags, FX_FLOAT fx, FX_FLOAT fy) {
   if (!IsButtonDown()) {
     return FALSE;
   }
   SetButtonDown(FALSE);
   const FX_WCHAR* wsURLContent = GetLinkURLAtPoint(fx, fy);
   if (NULL == wsURLContent) {
     return FALSE;
   }
   CXFA_FFDoc* pDoc = GetDoc();
-  pDoc->GetDocProvider()->GotoURL(pDoc, CFX_WideStringC(wsURLContent), FALSE);
+  pDoc->GetDocProvider()->GotoURL(pDoc, wsURLContent, FALSE);
   return TRUE;
 }
 FWL_WidgetHit CXFA_FFText::OnHitTest(FX_FLOAT fx, FX_FLOAT fy) {
   CFX_RectF rtBox;
   GetRectWithoutRotate(rtBox);
   if (!rtBox.Contains(fx, fy))
     return FWL_WidgetHit::Unknown;
   if (!GetLinkURLAtPoint(fx, fy))
     return FWL_WidgetHit::Unknown;
   return FWL_WidgetHit::HyperLink;
@@ skipping 18 matching lines @@
     }
   }
   return NULL;
 }
 void CXFA_FFText::FWLToClient(FX_FLOAT& fx, FX_FLOAT& fy) {
   CFX_RectF rtWidget;
   GetRectWithoutRotate(rtWidget);
   fx -= rtWidget.left;
   fy -= rtWidget.top;
 }