Remove SiteIsolationPolicy::IsSwappedOutStateForbidden().

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 97 matching lines @@
   void WillBeginCompositorFrame();
 
   // Out-of-process child frames receive a signal from RenderWidgetCompositor
   // when a compositor frame has committed.
   void DidCommitCompositorFrame();
 
   // Pass replicated information, such as security origin, to this
   // RenderFrameProxy's WebRemoteFrame.
   void SetReplicatedState(const FrameReplicationState& state);
 
-  // Navigating a top-level frame cross-process does not swap the WebLocalFrame
-  // for a WebRemoteFrame in the frame tree. In this case, this WebRemoteFrame
-  // is not attached to the frame tree and there is no blink::Frame associated
-  // with it, so it is not in state where most operations on it will succeed.
-  bool IsMainFrameDetachedFromTree() const;
-
   int routing_id() { return routing_id_; }
   RenderViewImpl* render_view() { return render_view_; }
   blink::WebRemoteFrame* web_frame() { return web_frame_; }
 
   // Returns the widget used for the local frame root.
   RenderWidget* render_widget() { return render_widget_; }
 
   // blink::WebRemoteFrameClient implementation:
   void frameDetached(DetachType type) override;
   void postMessageEvent(blink::WebLocalFrame* sourceFrame,
@@ skipping 56 matching lines @@
 
   RenderViewImpl* render_view_;
   RenderWidget* render_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameProxy);
 };
 
 }  // namespace
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_PROXY_H_