Revert of Move dispatchDidFirstVisuallyNonEmptyLayout into WebViewImpl.

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index 658e9df69d0958472e573808d1a75d3d7163a007..a8bb967ccd28eda6f44ecbb7bee578e7afa13204 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -233,7 +233,6 @@
 
     void incrementVisuallyNonEmptyCharacterCount(unsigned);
     void incrementVisuallyNonEmptyPixelCount(const IntSize&);
-    bool isVisuallyNonEmpty() const { return m_isVisuallyNonEmpty; }
     void setIsVisuallyNonEmpty() { m_isVisuallyNonEmpty = true; }
     void enableAutoSizeMode(const IntSize& minSize, const IntSize& maxSize);
     void disableAutoSizeMode();
@@ -778,6 +777,7 @@
     unsigned m_visuallyNonEmptyCharacterCount;
     unsigned m_visuallyNonEmptyPixelCount;
     bool m_isVisuallyNonEmpty;
+    bool m_firstVisuallyNonEmptyLayoutCallbackPending;
 
     RefPtrWillBeMember<Node> m_scrollAnchor;