Re-land "Rename CFWL_Thread classes to ThreadImp"

xfa/src/fwl/src/lightwidget/app.cpp

Index: xfa/src/fwl/src/lightwidget/app.cpp
diff --git a/xfa/src/fwl/src/lightwidget/app.cpp b/xfa/src/fwl/src/lightwidget/app.cpp
index 3d49fab015dc1886b05e81a4dc158ffa571497dd..293a258f6bb34440026bba2f9b42883c79eb1806 100644
--- a/xfa/src/fwl/src/lightwidget/app.cpp
+++ b/xfa/src/fwl/src/lightwidget/app.cpp
@@ -5,31 +5,23 @@
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../../foxitlib.h"
-CFWL_App::CFWL_App() : m_pAppImp(NULL), m_pThemeProvider(NULL) {
-  m_pAppImp = IFWL_App::Create(NULL);
-}
+CFWL_App::CFWL_App() : m_pIface(IFWL_App::Create(nullptr)), m_pTheme(nullptr) {}
 CFWL_App::~CFWL_App() {
-  if (m_pThemeProvider) {
-    m_pThemeProvider->Finalize();
-    delete m_pThemeProvider;
-    m_pThemeProvider = NULL;
+  if (m_pTheme) {
+    m_pTheme->Finalize();
+    delete m_pTheme;
+    m_pTheme = NULL;
   }
-  m_pAppImp->Release();
+  m_pIface->Release();
 }
 FWL_ERR CFWL_App::Initialize() {
-  m_pThemeProvider = new CFWL_Theme;
-  m_pThemeProvider->Initialize();
-  m_pAppImp->SetThemeProvider((IFWL_ThemeProvider*)m_pThemeProvider);
-  return m_pAppImp->Initialize();
-}
-CFWL_Theme* CFWL_App::GetTheme() {
-  return m_pThemeProvider;
+  m_pTheme = new CFWL_Theme;
+  m_pTheme->Initialize();
+  m_pIface->SetThemeProvider(m_pTheme);
+  return m_pIface->Initialize();
 }
 FWL_ERR CFWL_App::Exit(int32_t iExitCode) {
-  if (!m_pAppImp)
+  if (!m_pIface)
     return FWL_ERR_Indefinite;
-  return m_pAppImp->Exit(iExitCode);
-}
-IFWL_App* CFWL_App::GetApp() {
-  return m_pAppImp;
+  return m_pIface->Exit(iExitCode);
 }