Delete NetworkingContext and its subclasses.

Source/core/loader/FrameLoader.h

Index: Source/core/loader/FrameLoader.h
diff --git a/Source/core/loader/FrameLoader.h b/Source/core/loader/FrameLoader.h
index e129cfbc8d979fa527d11d8435d9ad6f92c645ea..72322a64b398f8bdb3396aa5771652fd84eca4e4 100644
--- a/Source/core/loader/FrameLoader.h
+++ b/Source/core/loader/FrameLoader.h
@@ -58,9 +58,7 @@ class Event;
 class FormState;
 class FormSubmission;
 class FrameLoaderClient;
-class FrameNetworkingContext;
 class NavigationAction;
-class NetworkingContext;
 class Page;
 class ResourceError;
 class ResourceRequest;
@@ -257,8 +255,6 @@ public:
     };
     PageDismissalType pageDismissalEventBeingDispatched() const { return m_pageDismissalEventBeingDispatched; }
 
-    NetworkingContext* networkingContext() const;
-
     void reportMemoryUsage(MemoryObjectInfo*) const;
 
 private:
@@ -383,8 +379,6 @@ private:
 
     SandboxFlags m_forcedSandboxFlags;
 
-    RefPtr<FrameNetworkingContext> m_networkingContext;
-
     RefPtr<HistoryItem> m_requestedHistoryItem;
 };