When a proxy is detached, immediately delete its associated provisional frame.

content/renderer/render_frame_proxy.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_RENDERER_RENDER_FRAME_PROXY_H_
 #define CONTENT_RENDERER_RENDER_FRAME_PROXY_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
@@ skipping 100 matching lines @@
   void DidCommitCompositorFrame();
 
   // Pass replicated information, such as security origin, to this
   // RenderFrameProxy's WebRemoteFrame.
   void SetReplicatedState(const FrameReplicationState& state);
 
   int routing_id() { return routing_id_; }
   RenderViewImpl* render_view() { return render_view_; }
   blink::WebRemoteFrame* web_frame() { return web_frame_; }
 
+  void set_provisional_frame_routing_id(int routing_id) {
+    provisional_frame_routing_id_ = routing_id;
+  }
+
+  int provisional_frame_routing_id() { return provisional_frame_routing_id_; }
+
   // Returns the widget used for the local frame root.
   RenderWidget* render_widget() { return render_widget_; }
 
   // blink::WebRemoteFrameClient implementation:
   void frameDetached(DetachType type) override;
   void forwardPostMessage(blink::WebLocalFrame* sourceFrame,
                           blink::WebRemoteFrame* targetFrame,
                           blink::WebSecurityOrigin target,
                           blink::WebDOMMessageEvent event) override;
   void navigate(const blink::WebURLRequest& request,
                 bool should_replace_current_entry) override;
   void forwardInputEvent(const blink::WebInputEvent* event) override;
   void frameRectsChanged(const blink::WebRect& frame_rect) override;
   void updateRemoteViewportIntersection(
       const blink::WebRect& viewportIntersection) override;
   void visibilityChanged(bool visible) override;
   void setHasReceivedUserGesture() override;
   void didChangeOpener(blink::WebFrame* opener) override;
   void advanceFocus(blink::WebFocusType type,
                     blink::WebLocalFrame* source) override;
   void frameFocused() override;
 
   // IPC handlers
   void OnDidStartLoading();
 
  private:
-  RenderFrameProxy(int routing_id, int frame_routing_id);
+  RenderFrameProxy(int routing_id);
 
   void Init(blink::WebRemoteFrame* frame,
             RenderViewImpl* render_view,
             RenderWidget* render_widget);
 
   // IPC::Listener
   bool OnMessageReceived(const IPC::Message& msg) override;
 
   // IPC handlers
   void OnDeleteProxy();
@@ skipping 14 matching lines @@
   void OnSetFrameOwnerProperties(const FrameOwnerProperties& properties);
   void OnDidUpdateOrigin(const url::Origin& origin,
                          bool is_potentially_trustworthy_unique_origin);
   void OnSetPageFocus(bool is_focused);
   void OnSetFocusedFrame();
   void OnWillEnterFullscreen();
 
   // The routing ID by which this RenderFrameProxy is known.
   const int routing_id_;
 
-  // The routing ID of the local RenderFrame (if any) which this
-  // RenderFrameProxy is meant to replace in the frame tree.
-  const int frame_routing_id_;
+  // The routing ID of the provisional RenderFrame (if any) that is meant to
+  // replace this RenderFrameProxy in the frame tree.
+  int provisional_frame_routing_id_;
 
   // Stores the WebRemoteFrame we are associated with.
   blink::WebRemoteFrame* web_frame_;
   scoped_refptr<ChildFrameCompositingHelper> compositing_helper_;
 
   RenderViewImpl* render_view_;
   RenderWidget* render_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameProxy);
 };
 
 }  // namespace
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_PROXY_H_