Revert of Detach old frame on WebFrame::swap.

Source/web/tests/FrameTestHelpers.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 87 matching lines @@
     SettingOverrider* m_settingOverrider;
 };
 
 // Minimal implementation of WebFrameClient needed for unit tests that load frames. Tests that load
 // frames and need further specialization of WebFrameClient behavior should subclass this.
 class TestWebFrameClient : public WebFrameClient {
 public:
     TestWebFrameClient();
 
     virtual WebFrame* createChildFrame(WebLocalFrame* parent, WebTreeScopeType, const WebString& frameName, WebSandboxFlags) override;
-    virtual void frameDetached(WebFrame*, DetachType) override;
+    virtual void frameDetached(WebFrame*) override;
     virtual void didStartLoading(bool) override;
     virtual void didStopLoading() override;
 
     bool isLoading() { return m_loadsInProgress > 0; }
     void waitForLoadToComplete();
 
 private:
     int m_loadsInProgress;
 };
 
 // Minimal implementation of WebRemoteFrameClient needed for unit tests that load remote frames. Tests that load
 // frames and need further specialization of WebFrameClient behavior should subclass this.
 class TestWebRemoteFrameClient : public WebRemoteFrameClient {
 public:
     TestWebRemoteFrameClient();
 
     WebRemoteFrame* frame() const { return m_frame; }
 
     // WebRemoteFrameClient overrides:
-    void frameDetached(DetachType) override;
+    void frameDetached() override;
     void postMessageEvent(
         WebLocalFrame* sourceFrame,
         WebRemoteFrame* targetFrame,
         WebSecurityOrigin targetOrigin,
         WebDOMMessageEvent) override { }
 
 private:
     WebRemoteFrame* const m_frame;
 };
 
@@ skipping 20 matching lines @@
     {
         Settings::setMockScrollbarsEnabled(false);
         RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(false);
     }
 };
 
 } // namespace FrameTestHelpers
 } // namespace blink
 
 #endif // FrameTestHelpers_h