Remove old repaint rect tracking from FrameView.

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 a1b2b4383ff62b44434aa193bdc964110947d04a..5dabe604727d9a5cea1a1dab025a9ecc34be92c7 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -292,8 +292,6 @@ public:
     bool isTrackingPaintInvalidations() const { return m_isTrackingPaintInvalidations; }
     void resetTrackedPaintInvalidations();
 
-    String trackedPaintInvalidationRectsAsText() const;
-
     using ScrollableAreaSet = WillBeHeapHashSet<RawPtrWillBeMember<ScrollableArea>>;
     void addScrollableArea(ScrollableArea*);
     void removeScrollableArea(ScrollableArea*);
@@ -767,9 +765,6 @@ private:
 
     bool m_isTrackingPaintInvalidations; // Used for testing.
 
-    // In frame coordinates.
-    Vector<IntRect> m_trackedPaintInvalidationRects;
-
     RefPtrWillBeMember<Node> m_nodeToDraw;
     bool m_isPainting;