Make code compile with clang_use_chrome_plugin (part V)chromium/2770

This change mainly contains files in xfa/fxfa 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;

BUG=pdfium:469

Review-Url: https://codereview.chromium.org/2071683002

1 files changed, 1 insertions, 1 deletions

diff --git a/xfa/fxfa/parser/xfa_script_layoutpseudomodel.h b/xfa/fxfa/parser/xfa_script_layoutpseudomodel.h
index 2fb0dba303..02e25b42f5 100644
--- a/xfa/fxfa/parser/xfa_script_layoutpseudomodel.h
+++ b/xfa/fxfa/parser/xfa_script_layoutpseudomodel.h
@@ -21,7 +21,7 @@ enum XFA_LAYOUTMODEL_HWXY {
 class CScript_LayoutPseudoModel : public CXFA_OrdinaryObject {
  public:
   explicit CScript_LayoutPseudoModel(CXFA_Document* pDocument);
-  ~CScript_LayoutPseudoModel();
+  ~CScript_LayoutPseudoModel() override;
 
   void Script_LayoutPseudoModel_Ready(CFXJSE_Value* pValue,
                                       FX_BOOL bSetting,