Pass implementation object to supplemental classes by reference

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index 204d8aaa7ac60db0695e3797a7f54f7e85d79f1c..9fa663b8f6c9fee3d0b2efbefc5144178bef48b7 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -2030,6 +2030,7 @@ void FrameView::performPostLayoutTasks()
     m_frame->selection().setCaretRectNeedsUpdate();
     m_frame->selection().updateAppearance();
 
+    ASSERT(m_frame->document());
     if (m_nestedLayoutCount <= 1) {
         if (m_firstLayoutCallbackPending) {
             m_firstLayoutCallbackPending = false;
@@ -2049,7 +2050,7 @@ void FrameView::performPostLayoutTasks()
         }
     }
 
-    FontFaceSet::didLayout(m_frame->document());
+    FontFaceSet::didLayout(*m_frame->document());
 
     updateWidgetPositions();