Make code compile with clang_use_chrome_plugin (part IV)

fpdfsdk/pdfwindow/PWL_Icon.h

 // 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
 
 #ifndef FPDFSDK_PDFWINDOW_PWL_ICON_H_
 #define FPDFSDK_PDFWINDOW_PWL_ICON_H_
 
 #include "core/fxcrt/include/fx_string.h"
@@ skipping 20 matching lines @@
  protected:
   CPDF_Stream* m_pPDFStream;
   CFX_ByteString m_sImageAlias;
 };
 
 class CPWL_Icon : public CPWL_Image {
  public:
   CPWL_Icon();
   ~CPWL_Icon() override;
 
-  virtual CPDF_IconFit* GetIconFit() { return m_pIconFit; }
+  virtual CPDF_IconFit* GetIconFit();
 
   // CPWL_Image
   void GetScale(FX_FLOAT& fHScale, FX_FLOAT& fVScale) override;
   void GetImageOffset(FX_FLOAT& x, FX_FLOAT& y) override;
 
   int32_t GetScaleMethod();
   FX_BOOL IsProportionalScale();
   void GetIconPosition(FX_FLOAT& fLeft, FX_FLOAT& fBottom);
 
   void SetIconFit(CPDF_IconFit* pIconFit) { m_pIconFit = pIconFit; }
 
  private:
   CPDF_IconFit* m_pIconFit;
 };
 
 #endif  // FPDFSDK_PDFWINDOW_PWL_ICON_H_