Rename ContextDestructionObserver to ContextLifecycleObserver

Source/core/dom/NamedFlowCollection.h

Index: Source/core/dom/NamedFlowCollection.h
diff --git a/Source/core/dom/NamedFlowCollection.h b/Source/core/dom/NamedFlowCollection.h
index ef163b8325f6c36656b7957d78f529cf9da2f3b8..47107e00c7e544573e770956497585366b5d442b 100644
--- a/Source/core/dom/NamedFlowCollection.h
+++ b/Source/core/dom/NamedFlowCollection.h
@@ -30,7 +30,7 @@
 #ifndef NamedFlowCollection_h
 #define NamedFlowCollection_h
 
-#include "core/dom/ContextDestructionObserver.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/NamedFlow.h"
 #include <wtf/Forward.h>
 #include <wtf/ListHashSet.h>
@@ -43,7 +43,7 @@ namespace WebCore {
 class Document;
 class DOMNamedFlowCollection;
 
-class NamedFlowCollection : public RefCounted<NamedFlowCollection>, public ContextDestructionObserver {
+class NamedFlowCollection : public RefCounted<NamedFlowCollection>, public ContextLifecycleObserver {
 public:
     static PassRefPtr<NamedFlowCollection> create(Document* doc) { return adoptRef(new NamedFlowCollection(doc)); }