Remove resource type-specific fetching logic from ResourceFetcher

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 58340fd9b3733b006e2141bfbccce67610c7ac88..85465bd19c3a0b4a2dc6fa6c90cb3e45db24b5ec 100644
--- a/Source/core/fetch/Resource.h
+++ b/Source/core/fetch/Resource.h
@@ -85,6 +85,7 @@ public:
         DecodeError
     };
 
+    // Exposed for testing.
     Resource(const ResourceRequest&, Type);
 #if ENABLE(OILPAN)
     virtual ~Resource();
@@ -104,6 +105,7 @@ public:
     virtual String encoding() const { return String(); }
     virtual void appendData(const char*, unsigned);
     virtual void error(Resource::Status);
+    virtual void setCORSFailed() { }
 
     void setNeedsSynchronousCacheHit(bool needsSynchronousCacheHit) { m_needsSynchronousCacheHit = needsSynchronousCacheHit; }
 
@@ -416,6 +418,17 @@ private:
     static unsigned s_instanceCount;
 };
 
+class ResourceFactory {
+public:
+    virtual Resource* create(const ResourceRequest&, const String&) const = 0;
+    Resource::Type type() const { return m_type; }
+
+protected:
+    ResourceFactory(Resource::Type type) : m_type(type) { }
+
+    Resource::Type m_type;
+};
+
 #if !LOG_DISABLED
 // Intended to be used in LOG statements.
 const char* ResourceTypeName(Resource::Type);