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
diff --git a/xfa/fwl/lightwidget/cfwl_barcode.cpp b/xfa/fwl/lightwidget/cfwl_barcode.cpp
index 4b998d0..2e29d63 100644
--- a/xfa/fwl/lightwidget/cfwl_barcode.cpp
+++ b/xfa/fwl/lightwidget/cfwl_barcode.cpp
@@ -44,7 +44,67 @@
     return 0;
   return static_cast<IFWL_Barcode*>(m_pIface)->IsProtectedType();
 }
+
+CFWL_Barcode::CFWL_BarcodeDP::CFWL_BarcodeDP()
+    : m_dwAttributeMask(FWL_BCDATTRIBUTE_NONE) {}
+
 FWL_Error CFWL_Barcode::CFWL_BarcodeDP::GetCaption(IFWL_Widget* pWidget,
                                                    CFX_WideString& wsCaption) {
   return FWL_Error::Succeeded;
 }
+
+BC_CHAR_ENCODING CFWL_Barcode::CFWL_BarcodeDP::GetCharEncoding() {
+  return m_eCharEncoding;
+}
+
+int32_t CFWL_Barcode::CFWL_BarcodeDP::GetModuleHeight() {
+  return m_nModuleHeight;
+}
+
+int32_t CFWL_Barcode::CFWL_BarcodeDP::GetModuleWidth() {
+  return m_nModuleWidth;
+}
+
+int32_t CFWL_Barcode::CFWL_BarcodeDP::GetDataLength() {
+  return m_nDataLength;
+}
+
+int32_t CFWL_Barcode::CFWL_BarcodeDP::GetCalChecksum() {
+  return m_nCalChecksum;
+}
+
+FX_BOOL CFWL_Barcode::CFWL_BarcodeDP::GetPrintChecksum() {
+  return m_bPrintChecksum;
+}
+
+BC_TEXT_LOC CFWL_Barcode::CFWL_BarcodeDP::GetTextLocation() {
+  return m_eTextLocation;
+}
+
+int32_t CFWL_Barcode::CFWL_BarcodeDP::GetWideNarrowRatio() {
+  return m_nWideNarrowRatio;
+}
+
+FX_CHAR CFWL_Barcode::CFWL_BarcodeDP::GetStartChar() {
+  return m_cStartChar;
+}
+
+FX_CHAR CFWL_Barcode::CFWL_BarcodeDP::GetEndChar() {
+  return m_cEndChar;
+}
+
+int32_t CFWL_Barcode::CFWL_BarcodeDP::GetVersion() {
+  return m_nVersion;
+}
+
+int32_t CFWL_Barcode::CFWL_BarcodeDP::GetErrorCorrectionLevel() {
+  return m_nECLevel;
+}
+
+FX_BOOL CFWL_Barcode::CFWL_BarcodeDP::GetTruncated() {
+  return m_bTruncated;
+}
+
+uint32_t CFWL_Barcode::CFWL_BarcodeDP::GetBarcodeAttributeMask() {
+  return m_dwAttributeMask;
+}