Revert of Revert of Revert of Reland factor out window proxy management

Source/bindings/core/v8/WindowProxyManager.h

Index: Source/bindings/core/v8/WindowProxyManager.h
diff --git a/Source/bindings/core/v8/WindowProxyManager.h b/Source/bindings/core/v8/WindowProxyManager.h
deleted file mode 100644
index 83b6f32f996f59631dbce5089c3b592db660db0f..0000000000000000000000000000000000000000
--- a/Source/bindings/core/v8/WindowProxyManager.h
+++ /dev/null
@@ -1,56 +0,0 @@
-// Copyright 2015 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 WindowProxyManager_h
-#define WindowProxyManager_h
-
-#include "platform/heap/Handle.h"
-#include "wtf/Vector.h"
-#include <utility>
-#include <v8.h>
-
-namespace blink {
-
-class DOMWrapperWorld;
-class Frame;
-class ScriptState;
-class SecurityOrigin;
-class WindowProxy;
-
-class WindowProxyManager final : public NoBaseWillBeGarbageCollectedFinalized<WindowProxyManager> {
-public:
-    static PassOwnPtrWillBeRawPtr<WindowProxyManager> create(Frame*);
-
-    ~WindowProxyManager();
-    void trace(Visitor*);
-
-    Frame* frame() const { return m_frame.get(); }
-    v8::Isolate* isolate() const { return m_isolate; }
-    WindowProxy* mainWorldProxy() const { return m_windowProxy.get(); }
-
-    WindowProxy* windowProxy(DOMWrapperWorld&);
-
-    void clearForClose();
-    void clearForNavigation();
-
-    // For devtools:
-    WindowProxy* existingWindowProxy(DOMWrapperWorld&);
-    void collectIsolatedContexts(Vector<std::pair<ScriptState*, SecurityOrigin*>>&);
-    void setWorldDebugId(int worldId, int debuggerId);
-
-private:
-    typedef WillBeHeapHashMap<int, OwnPtrWillBeMember<WindowProxy> > IsolatedWorldMap;
-
-    explicit WindowProxyManager(Frame*);
-
-    RawPtrWillBeMember<Frame> m_frame;
-    v8::Isolate* const m_isolate;
-
-    const OwnPtrWillBeMember<WindowProxy> m_windowProxy;
-    IsolatedWorldMap m_isolatedWorlds;
-};
-
-} // namespace blink
-
-#endif // WindowProxyManager_h