Refactoring: Introduce ResouceLoaderHost interface for unloading ResourceLoader.

Source/core/loader/ResourceLoader.h

Index: Source/core/loader/ResourceLoader.h
diff --git a/Source/core/loader/ResourceLoader.h b/Source/core/loader/ResourceLoader.h
index 9582dac9b0995dc29cebfcd8d8abc50f4a45b655..c1459d748d072c02d1a9400ae82f146031bb9f58 100644
--- a/Source/core/loader/ResourceLoader.h
+++ b/Source/core/loader/ResourceLoader.h
@@ -47,18 +47,17 @@ class FrameLoader;
 class KURL;
 class ResourceBuffer;
 class ResourceHandle;
+class ResourceLoaderHost;
 
 class ResourceLoader : public RefCounted<ResourceLoader>, protected ResourceHandleClient {
 public:
-    static PassRefPtr<ResourceLoader> create(DocumentLoader*, CachedResource*, const ResourceRequest&, const ResourceLoaderOptions&);
+    static PassRefPtr<ResourceLoader> create(ResourceLoaderHost*, CachedResource*, const ResourceRequest&, const ResourceLoaderOptions&);
     virtual ~ResourceLoader();
 
     void cancel();
     void cancel(const ResourceError&);
     void cancelIfNotFinishing();
 
-    FrameLoader* frameLoader() const;
-    DocumentLoader* documentLoader() const { return m_documentLoader.get(); }
     CachedResource* cachedResource() { return m_resource; }
     const ResourceRequest& originalRequest() const { return m_originalRequest; }
 
@@ -86,15 +85,15 @@ public:
     ResourceHandle* handle() const { return m_handle.get(); }
     bool shouldSendResourceLoadCallbacks() const { return m_options.sendLoadCallbacks == SendCallbacks; }
     bool shouldSniffContent() const { return m_options.sniffContent == SniffContent; }
+    bool isLoadedBy(CachedResourceLoader*) const;
 
     bool reachedTerminalState() const { return m_state == Terminated; }
-
     const ResourceRequest& request() const { return m_request; }
 
     void reportMemoryUsage(MemoryObjectInfo*) const;
 
 private:
-    ResourceLoader(DocumentLoader*, CachedResource*, ResourceLoaderOptions);
+    ResourceLoader(ResourceLoaderHost*, CachedResource*, const ResourceLoaderOptions&);
 
     bool init(const ResourceRequest&);
     void start();
@@ -102,8 +101,7 @@ private:
     void didFinishLoadingOnePart(double finishTime);
 
     RefPtr<ResourceHandle> m_handle;
-    RefPtr<Frame> m_frame;
-    RefPtr<DocumentLoader> m_documentLoader;
+    RefPtr<ResourceLoaderHost> m_host;
 
     ResourceRequest m_request;
     ResourceRequest m_originalRequest; // Before redirects.
@@ -124,10 +122,10 @@ private:
 
     class RequestCountTracker {
     public:
-        RequestCountTracker(CachedResourceLoader*, CachedResource*);
+        RequestCountTracker(ResourceLoaderHost*, CachedResource*);
         ~RequestCountTracker();
     private:
-        CachedResourceLoader* m_cachedResourceLoader;
+        ResourceLoaderHost* m_host;
         CachedResource* m_resource;
     };