Make CPDF_Object::GetString() a virtual method.

fpdfsdk/src/pdfwindow/PWL_Icon.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 "../../include/pdfwindow/PDFWindow.h"
 #include "../../include/pdfwindow/PWL_Wnd.h"
 #include "../../include/pdfwindow/PWL_Icon.h"
 #include "../../include/pdfwindow/PWL_Utils.h"
@@ skipping 81 matching lines @@
 }
 
 CFX_ByteString CPWL_Image::GetImageAlias()
 {
         if (m_sImageAlias.IsEmpty())
         {
                 if (m_pPDFStream)
                 {
                         if (CPDF_Dictionary * pDict = m_pPDFStream->GetDict())
                         {
-                                return pDict->GetString("Name");
+                                return pDict->GetStringAt("Name");
                         }
                 }
         }
         else
                 return m_sImageAlias;
 
         return CFX_ByteString();
 }
 
 void CPWL_Image::SetImageAlias(const FX_CHAR* sImageAlias)
@@ skipping 140 matching lines @@
 
         FX_FLOAT fPlateWidth,fPlateHeight;
         CPDF_Rect rcPlate = GetClientRect();
         fPlateWidth = rcPlate.right - rcPlate.left;
         fPlateHeight = rcPlate.top - rcPlate.bottom;
 
         x = (fPlateWidth - fImageFactWidth) * fLeft;
         y = (fPlateHeight - fImageFactHeight)  * fBottom;
 }