Rename ContextDestructionObserver to ContextLifecycleObserver

Source/core/dom/NamedFlowCollection.cpp

Index: Source/core/dom/NamedFlowCollection.cpp
diff --git a/Source/core/dom/NamedFlowCollection.cpp b/Source/core/dom/NamedFlowCollection.cpp
index ea888317daf13620d86b8b99605da9ef90b3620d..8672d6db33d171f84bc9377bc93d4e0101b695e2 100644
--- a/Source/core/dom/NamedFlowCollection.cpp
+++ b/Source/core/dom/NamedFlowCollection.cpp
@@ -42,7 +42,7 @@
 namespace WebCore {
 
 NamedFlowCollection::NamedFlowCollection(Document* document)
-    : ContextDestructionObserver(document)
+    : ContextLifecycleObserver(document)
 {
     ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
 }
@@ -104,7 +104,7 @@ void NamedFlowCollection::discardNamedFlow(NamedFlow* namedFlow)
 
 Document* NamedFlowCollection::document() const
 {
-    ScriptExecutionContext* context = ContextDestructionObserver::scriptExecutionContext();
+    ScriptExecutionContext* context = ContextLifecycleObserver::scriptExecutionContext();
     return toDocument(context);
 }