Move SwapOut methods to RenderFrameHost.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index b6ebfa9fd35c34a5df1222edbf529c7d87133ea8..fc5b6bfdfb3c2d1d11c5a6195b833faf9b748e66 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -38,6 +38,9 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // Blink's notion of the throbber stopping.
   virtual void DidStopLoading(RenderFrameHost* render_frame_host) {}
 
+  // The RenderFrameHost has been swapped out.
+  virtual void SwappedOut(RenderFrameHost* render_frame_host) {}
+
   // Notification that a worker process has crashed.
   virtual void WorkerCrashed(RenderFrameHost* render_frame_host) {}