Revert of DevTools: use per-LocalFrame instrumenting agents instead of per-Page ones.

Source/core/inspector/InspectorResourceContentLoader.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InspectorResourceContentLoader_h
 #define InspectorResourceContentLoader_h
 
 #include "core/fetch/ResourcePtr.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class LocalFrame;
+class Page;
 class Resource;
 class VoidCallback;
 
 class InspectorResourceContentLoader final : public NoBaseWillBeGarbageCollectedFinalized<InspectorResourceContentLoader> {
     WTF_MAKE_NONCOPYABLE(InspectorResourceContentLoader);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
-    explicit InspectorResourceContentLoader(LocalFrame*);
+    explicit InspectorResourceContentLoader(Page*);
     void ensureResourcesContentLoaded(VoidCallback*);
     ~InspectorResourceContentLoader();
     void trace(Visitor*);
     void dispose();
     bool hasFinished();
     void stop();
 
 private:
     class ResourceClient;
 
     void resourceFinished(ResourceClient*);
     void checkDone();
     void start();
 
     PersistentHeapVectorWillBeHeapVector<Member<VoidCallback> > m_callbacks;
     bool m_allRequestsStarted;
     bool m_started;
-    RawPtrWillBeMember<LocalFrame> m_inspectedFrame;
+    RawPtrWillBeMember<Page> m_page;
     HashSet<ResourceClient*> m_pendingResourceClients;
     Vector<ResourcePtr<Resource> > m_resources;
 
     friend class ResourceClient;
 };
 
 } // namespace blink
 
 
 #endif // !defined(InspectorResourceContentLoader_h)