Add ContextLifecycleObserver::frame()

third_party/WebKit/Source/core/loader/appcache/ApplicationCache.cpp

Index: third_party/WebKit/Source/core/loader/appcache/ApplicationCache.cpp
diff --git a/third_party/WebKit/Source/core/loader/appcache/ApplicationCache.cpp b/third_party/WebKit/Source/core/loader/appcache/ApplicationCache.cpp
index 19e71db1ece31090638c95b99c4eb24bc0cba0e8..00ac7f1469b1d6d4335810d1867828f0e15e1108 100644
--- a/third_party/WebKit/Source/core/loader/appcache/ApplicationCache.cpp
+++ b/third_party/WebKit/Source/core/loader/appcache/ApplicationCache.cpp
@@ -39,7 +39,7 @@
 namespace blink {
 
 ApplicationCache::ApplicationCache(LocalFrame* frame)
-    : DOMWindowProperty(frame) {
+    : ContextLifecycleObserver(frame->document()) {
   ApplicationCacheHost* cacheHost = applicationCacheHost();
   if (cacheHost)
     cacheHost->setApplicationCache(this);
@@ -47,13 +47,12 @@ ApplicationCache::ApplicationCache(LocalFrame* frame)
 
 DEFINE_TRACE(ApplicationCache) {
   EventTargetWithInlineData::trace(visitor);
-  DOMWindowProperty::trace(visitor);
+  ContextLifecycleObserver::trace(visitor);
 }
 
-void ApplicationCache::frameDestroyed() {
+void ApplicationCache::contextDestroyed() {
   if (ApplicationCacheHost* cacheHost = applicationCacheHost())
     cacheHost->setApplicationCache(0);
-  DOMWindowProperty::frameDestroyed();
 }
 
 ApplicationCacheHost* ApplicationCache::applicationCacheHost() const {