Make code compile with clang_use_chrome_plugin (part VI)

This change mainly contains files in xfa/fwl 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/2070583003

1 files changed, 3 insertions, 8 deletions

diff --git a/xfa/fwl/lightwidget/cfwl_widgetproperties.h b/xfa/fwl/lightwidget/cfwl_widgetproperties.h
index 2a3e3ffefb..5d4116e62d 100644
--- a/xfa/fwl/lightwidget/cfwl_widgetproperties.h
+++ b/xfa/fwl/lightwidget/cfwl_widgetproperties.h
@@ -17,14 +17,9 @@ class IFWL_DataProvider;
 
 class CFWL_WidgetProperties {
  public:
-  CFWL_WidgetProperties()
-      : m_dwStyles(FWL_WGTSTYLE_Child),
-        m_dwStyleExes(0),
-        m_dwStates(0),
-        m_pParent(nullptr),
-        m_pOwner(nullptr) {
-    m_rtWidget.Set(0, 0, 0, 0);
-  }
+  CFWL_WidgetProperties();
+  ~CFWL_WidgetProperties();
+  CFWL_WidgetProperties(const CFWL_WidgetProperties& other);
 
   CFWL_WidgetImpProperties MakeWidgetImpProperties(
       IFWL_DataProvider* pDataProvider) const;