Revert of Ensure RenderFrameHost & NavigationHandle are not destroyed during commit

content/browser/frame_host/navigation_handle_impl.h

 // 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 CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_
 
 #include "content/public/browser/navigation_handle.h"
 
 #include <stddef.h>
@@ skipping 193 matching lines @@
   // delegate.
   void ReadyToCommitNavigation(RenderFrameHostImpl* render_frame_host);
 
   // Called when the navigation was committed in |render_frame_host|. This will
   // update the |state_|.
   void DidCommitNavigation(
       const FrameHostMsg_DidCommitProvisionalLoad_Params& params,
       bool same_page,
       RenderFrameHostImpl* render_frame_host);
 
-  // TODO(clamy): Remove this once enough data has been gathered for
-  // crbug.com/589365.
-  void set_is_in_commit(bool is_in_commit) { is_in_commit_ = is_in_commit; }
-
  private:
   friend class NavigationHandleImplTest;
 
   // Used to track the state the navigation is currently in.
   enum State {
     INITIAL = 0,
     WILL_SEND_REQUEST,
     DEFERRING_START,
     WILL_REDIRECT_REQUEST,
     DEFERRING_REDIRECT,
@@ skipping 61 matching lines @@
   int pending_nav_entry_id_;
 
   // This callback will be run when all throttle checks have been performed.
   ThrottleChecksFinishedCallback complete_callback_;
 
   // PlzNavigate
   // Manages the lifetime of a pre-created ServiceWorkerProviderHost until a
   // corresponding ServiceWorkerNetworkProvider is created in the renderer.
   scoped_ptr<ServiceWorkerNavigationHandle> service_worker_handle_;
 
-  // True if the RenderFrameHost that owns the NavigationHandle is in the
-  // process of committing a navigation.  This is temporary to help pinpoint
-  // the cause of crbug.com/589365.
-  // TODO(clamy): Remove once enough data has been gathered.
-  bool is_in_commit_;
-
   DISALLOW_COPY_AND_ASSIGN(NavigationHandleImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_