Revert of Revert of Reland factor out window proxy management portions of ScriptController.

Source/bindings/core/v8/ScriptController.h

Index: Source/bindings/core/v8/ScriptController.h
diff --git a/Source/bindings/core/v8/ScriptController.h b/Source/bindings/core/v8/ScriptController.h
index aea494ca7fcb3900e9d01f8e33fc20994ea44b0b..28a403428a37befeea23a3e926bb2025be85074a 100644
--- a/Source/bindings/core/v8/ScriptController.h
+++ b/Source/bindings/core/v8/ScriptController.h
@@ -32,8 +32,9 @@
 #define ScriptController_h
 
 #include "bindings/core/v8/SharedPersistent.h"
-
+#include "bindings/core/v8/WindowProxyManager.h"
 #include "core/fetch/CrossOriginAccessControl.h"
+#include "core/frame/LocalFrame.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
 #include "wtf/Vector.h"
@@ -49,7 +50,6 @@ class ExecutionContext;
 class HTMLDocument;
 class HTMLPlugInElement;
 class KURL;
-class LocalFrame;
 class ScriptState;
 class ScriptSourceCode;
 class SecurityOrigin;
@@ -150,22 +150,19 @@ public:
 
     void setWorldDebugId(int worldId, int debuggerId);
 
-    v8::Isolate* isolate() const { return m_isolate; }
+    v8::Isolate* isolate() const { return m_windowProxyManager->isolate(); }
 
 private:
     explicit ScriptController(LocalFrame*);
 
-    typedef WillBeHeapHashMap<int, OwnPtrWillBeMember<WindowProxy> > IsolatedWorldMap;
+    LocalFrame* frame() const { return toLocalFrame(m_windowProxyManager->frame()); }
+
     typedef HashMap<Widget*, NPObject*> PluginObjectMap;
 
     v8::Local<v8::Value> evaluateScriptInMainWorld(const ScriptSourceCode&, AccessControlStatus, ExecuteScriptPolicy, double* compilationFinishTime = 0);
 
-    RawPtrWillBeMember<LocalFrame> m_frame;
+    OwnPtrWillBeMember<WindowProxyManager> m_windowProxyManager;
     const String* m_sourceURL;
-    v8::Isolate* m_isolate;
-
-    OwnPtrWillBeMember<WindowProxy> m_windowProxy;
-    IsolatedWorldMap m_isolatedWorlds;
 
     // A mapping between Widgets and their corresponding script object.
     // This list is used so that when the plugin dies, we can immediately