Revert of [WeakMemoryCache] Remove Resource from MemoryCache just before destructed

third_party/WebKit/Source/core/fetch/MemoryCache.cpp

Index: third_party/WebKit/Source/core/fetch/MemoryCache.cpp
diff --git a/third_party/WebKit/Source/core/fetch/MemoryCache.cpp b/third_party/WebKit/Source/core/fetch/MemoryCache.cpp
index 925962d2e82aee962489dfa50439bf63dd3e1cdf..8aad84ef9bff434fae49d13d63ca1421cd1fa296 100644
--- a/third_party/WebKit/Source/core/fetch/MemoryCache.cpp
+++ b/third_party/WebKit/Source/core/fetch/MemoryCache.cpp
@@ -79,19 +79,11 @@
 DEFINE_TRACE(MemoryCacheEntry)
 {
     visitor->trace(m_resource);
-    visitor->template registerWeakMembers<MemoryCacheEntry, &MemoryCacheEntry::clearResourceWeak>(this);
+    visitor->trace(m_resourceWeak);
     visitor->trace(m_previousInLiveResourcesList);
     visitor->trace(m_nextInLiveResourcesList);
     visitor->trace(m_previousInAllResourcesList);
     visitor->trace(m_nextInAllResourcesList);
-}
-
-void MemoryCacheEntry::clearResourceWeak(Visitor* visitor)
-{
-    if (!m_resourceWeak || ThreadHeap::isHeapObjectAlive(m_resourceWeak))
-        return;
-    memoryCache()->remove(m_resourceWeak.get());
-    m_resourceWeak.clear();
 }
 
 void MemoryCacheEntry::dispose()