Rename FrameDestructionObserver to LocalFrameLifecycleObserver.

Source/core/frame/LocalFrameLifecycleNotifier.h

 // Copyright 2015 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.
 
 #ifndef LocalFrameLifecycleNotifier_h
 #define LocalFrameLifecycleNotifier_h
 
 #include "core/CoreExport.h"
 #include "platform/LifecycleNotifier.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
-class FrameDestructionObserver;
+class LocalFrameLifecycleObserver;
 class LocalFrame;
 
-class CORE_EXPORT LocalFrameLifecycleNotifier : public LifecycleNotifier<LocalFrame, FrameDestructionObserver> {
+class CORE_EXPORT LocalFrameLifecycleNotifier : public LifecycleNotifier<LocalFrame, LocalFrameLifecycleObserver> {
 public:
     void notifyWillDetachFrameHost();
 };
 
 } // namespace blink
 
 #endif // LocalFrameLifecycleNotifier_h