Rename ContextDestructionObserver to ContextLifecycleObserver

Source/bindings/v8/ActiveDOMCallback.h

Index: Source/bindings/v8/ActiveDOMCallback.h
diff --git a/Source/bindings/v8/ActiveDOMCallback.h b/Source/bindings/v8/ActiveDOMCallback.h
index 7b89c41d0ccf3da6a50d24d95af6fc2bee93545e..2015ddd4c7a47285e6c6a2a1bbaadf371e5a0df2 100644
--- a/Source/bindings/v8/ActiveDOMCallback.h
+++ b/Source/bindings/v8/ActiveDOMCallback.h
@@ -31,7 +31,7 @@
 #ifndef ActiveDOMCallback_h
 #define ActiveDOMCallback_h
 
-#include "core/dom/ContextDestructionObserver.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "wtf/OwnPtr.h"
 
 namespace WebCore {
@@ -45,7 +45,7 @@ class ScriptExecutionContext;
 //
 // Should only be created, used, and destroyed on the script execution
 // context thread.
-class ActiveDOMCallback : public ContextDestructionObserver {
+class ActiveDOMCallback : public ContextLifecycleObserver {
 public:
     ActiveDOMCallback(ScriptExecutionContext* context);
     virtual ~ActiveDOMCallback();