Revert "Reworks the clipping logic" and follow-up.

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 cdfa3a72851e8005b125f67f28d907238286c97d..82651f985500ae70882547b9d4dad3a933c3beaf 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -2480,14 +2480,6 @@ void FrameView::updateLifecyclePhasesInternal(LifeCycleUpdateOption phases)
                 || (RuntimeEnabledFeatures::slimmingPaintV2Enabled() && lifecycle().state() == DocumentLifecycle::CompositingForSlimmingPaintV2Clean));
         }
     }
-
-#ifndef NDEBUG
-    // TODO(jchaffraix): We will want to clear the clip rects in release too
-    // to reduce our long-term memory consumption. However this requires us
-    // to migrate all of the clip rects to the state machine and evaluate
-    // the performance impacts of this.
-    layoutView()->layer()->clipper().clearClipRectsIncludingDescendants(AbsoluteClipRects);
-#endif
 }
 
 void FrameView::paintForSlimmingPaintV2()