ResizeObserver implementation, part 2: lifetime

third_party/WebKit/Source/core/observer/ResizeObservation.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "core/observer/ResizeObserverEntry.h"
+#include "core/observer/ResizeObservation.h"
 
-#include "core/dom/ClientRect.h"
-#include "core/dom/DOMRectReadOnly.h"
 #include "core/dom/Element.h"
+#include "core/observer/ResizeObserver.h"
 
 namespace blink {
 
-class ResizeObservation;
-
-ResizeObserverEntry::ResizeObserverEntry(Element* target)
+ResizeObservation::ResizeObservation(Element* target, ResizeObserver* observer)
     : m_target(target)
+    , m_observer(observer)
 {
+    DCHECK(m_target);
 }
 
-DEFINE_TRACE(ResizeObserverEntry)
+DEFINE_TRACE(ResizeObservation)
 {
     visitor->trace(m_target);
-    visitor->trace(m_contentRect);
+    visitor->trace(m_observer);
 }
 
 } // namespace blink