Rename ContextDestructionObserver to ContextLifecycleObserver

Source/modules/performance/WorkerPerformance.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #include "config.h"
 #include "modules/performance/WorkerPerformance.h"
 
 #include "core/workers/DedicatedWorkerContext.h"
 #include "core/workers/WorkerContext.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
 
 WorkerPerformance::WorkerPerformance(ScriptExecutionContext* context)
-    : ContextDestructionObserver(context)
+    : ContextLifecycleObserver(context)
 {
 }
 
 WorkerPerformance::~WorkerPerformance()
 {
 }
 
 double WorkerPerformance::now() const
 {
     ScriptExecutionContext* context = scriptExecutionContext();
     ASSERT(context);
     ASSERT_WITH_SECURITY_IMPLICATION(context->isWorkerContext());
     WorkerContext* workerContext = static_cast<WorkerContext*>(context);
     return 1000.0 * (monotonicallyIncreasingTime() - workerContext->timeOrigin());
 }
 
 } // namespace WebCore