Reland "Move MemoryCache implementation details out of Resource"

Source/core/fetch/Resource.h

Index: Source/core/fetch/Resource.h
diff --git a/Source/core/fetch/Resource.h b/Source/core/fetch/Resource.h
index 89ddd36aeb1349f09cff6c919dc257caa73ba911..ed2a99a9fa554ea27f4415122c144a0364d711e0 100644
--- a/Source/core/fetch/Resource.h
+++ b/Source/core/fetch/Resource.h
@@ -180,7 +180,6 @@ public:
 
     void setCacheLiveResourcePriority(CacheLiveResourcePriority);
     unsigned cacheLiveResourcePriority() const { return m_cacheLiveResourcePriority; }
-    bool inLiveDecodedResourcesList() { return m_inLiveDecodedResourcesList; }
 
     void clearLoader();
 
@@ -365,7 +364,6 @@ private:
 
     unsigned m_preloadResult : 2; // PreloadResult
     unsigned m_cacheLiveResourcePriority : 2; // CacheLiveResourcePriority
-    unsigned m_inLiveDecodedResourcesList : 1;
     unsigned m_requestedFromNetworkingLayer : 1;
 
     unsigned m_inCache : 1;
@@ -382,15 +380,8 @@ private:
 
 #ifndef NDEBUG
     bool m_deleted;
-    unsigned m_lruIndex;
 #endif
 
-    Resource* m_nextInAllResourcesList;
-    Resource* m_prevInAllResourcesList;
-
-    Resource* m_nextInLiveResourcesList;
-    Resource* m_prevInLiveResourcesList;
-
     // If this field is non-null we are using the resource as a proxy for checking whether an existing resource is still up to date
     // using HTTP If-Modified-Since/If-None-Match headers. If the response is 304 all clients of this resource are moved
     // to to be clients of m_resourceToRevalidate and the resource is deleted. If not, the field is zeroed and this