Make code compile with clang_use_chrome_plugin (part IV)

This change mainly contains files in fpdfsdk/ directory.
This is part of the efforts to make PDFium code compilable
by Clang chromium style plugins.

The changes are mainly the following:
-- move inline constructor/destructor of complex class/struct out-of-line;
-- add constructor/destructor of complex class/struct if not
 explicitly defined;
-- add explicit out-of-line copy constructor when needed;
-- move inline virtual functions out-of-line;
-- Properly mark virtual functions with 'override';
-- some minor cleanups plus removing an unused file and splitting
cxfa_eventparam out from fxfa.h

BUG=pdfium:469

Review-Url: https://codereview.chromium.org/2062313002

1 files changed, 1 insertions, 1 deletions

diff --git a/fpdfsdk/pdfwindow/PWL_Icon.h b/fpdfsdk/pdfwindow/PWL_Icon.h
index a5bd907012..04d13a1411 100644
--- a/fpdfsdk/pdfwindow/PWL_Icon.h
+++ b/fpdfsdk/pdfwindow/PWL_Icon.h
@@ -38,7 +38,7 @@ class CPWL_Icon : public CPWL_Image {
   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;