Revert of Disable elastic overscroll effect in DevTools.

content/browser/devtools/devtools_frontend_host_impl.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 CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_FRONTEND_HOST_IMPL_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_FRONTEND_HOST_IMPL_H_
 
 #include "content/public/browser/devtools_frontend_host.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 
 class DevToolsFrontendHostImpl : public DevToolsFrontendHost,
                                  public WebContentsObserver {
  public:
   DevToolsFrontendHostImpl(RenderFrameHost* frontend_main_frame,
                            DevToolsFrontendHost::Delegate* delegate);
   ~DevToolsFrontendHostImpl() override;
 
  private:
   // WebContentsObserver overrides.
   bool OnMessageReceived(const IPC::Message& message,
                          RenderFrameHost* render_frame_host) override;
-  void RenderFrameCreated(RenderFrameHost* render_frame_host) override;
 
   void OnDispatchOnInspectorBackend(const std::string& message);
   void OnDispatchOnEmbedder(const std::string& message);
 
   DevToolsFrontendHost::Delegate* delegate_;
   DISALLOW_COPY_AND_ASSIGN(DevToolsFrontendHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_FRONTEND_HOST_IMPL_H_