Rename IFWL classes which do not have CFWL equivalents

xfa/fwl/core/cfwl_scrollbar.h

Index: xfa/fwl/core/cfwl_scrollbar.h
diff --git a/xfa/fwl/core/ifwl_scrollbar.h b/xfa/fwl/core/cfwl_scrollbar.h
similarity index 93%
rename from xfa/fwl/core/ifwl_scrollbar.h
rename to xfa/fwl/core/cfwl_scrollbar.h
index a5619b79a4030ce53d3f29be74f09fc12e7da260..69f362d5310e378d7da299dcc16b8594156e673e 100644
--- a/xfa/fwl/core/ifwl_scrollbar.h
+++ b/xfa/fwl/core/cfwl_scrollbar.h
@@ -4,8 +4,8 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#ifndef XFA_FWL_CORE_IFWL_SCROLLBAR_H_
-#define XFA_FWL_CORE_IFWL_SCROLLBAR_H_
+#ifndef XFA_FWL_CORE_CFWL_SCROLLBAR_H_
+#define XFA_FWL_CORE_CFWL_SCROLLBAR_H_
 
 #include <memory>
 
@@ -20,12 +20,12 @@ class IFWL_Widget;
 #define FWL_STYLEEXT_SCB_Horz (0L << 0)
 #define FWL_STYLEEXT_SCB_Vert (1L << 0)
 
-class IFWL_ScrollBar : public IFWL_Widget {
+class CFWL_ScrollBar : public IFWL_Widget {
  public:
-  IFWL_ScrollBar(const CFWL_App* app,
+  CFWL_ScrollBar(const CFWL_App* app,
                  std::unique_ptr<CFWL_WidgetProperties> properties,
                  IFWL_Widget* pOuter);
-  ~IFWL_ScrollBar() override;
+  ~CFWL_ScrollBar() override;
 
   // IFWL_Widget
   FWL_Type GetClassID() const override;
@@ -58,12 +58,12 @@ class IFWL_ScrollBar : public IFWL_Widget {
  private:
   class Timer : public CFWL_Timer {
    public:
-    explicit Timer(IFWL_ScrollBar* pToolTip);
+    explicit Timer(CFWL_ScrollBar* pToolTip);
     ~Timer() override {}
 
     void Run(CFWL_TimerInfo* pTimerInfo) override;
   };
-  friend class IFWL_ScrollBar::Timer;
+  friend class CFWL_ScrollBar::Timer;
 
   bool IsVertical() const {
     return !!(m_pProperties->m_dwStyleExes & FWL_STYLEEXT_SCB_Vert);
@@ -144,7 +144,7 @@ class IFWL_ScrollBar : public IFWL_Widget {
   CFX_RectF m_rtMinTrack;
   CFX_RectF m_rtMaxTrack;
   FX_FLOAT m_fMinThumb;
-  IFWL_ScrollBar::Timer m_Timer;
+  CFWL_ScrollBar::Timer m_Timer;
 };
 
-#endif  // XFA_FWL_CORE_IFWL_SCROLLBAR_H_
+#endif  // XFA_FWL_CORE_CFWL_SCROLLBAR_H_