Revert 250823 "With --site-per-process, avoid a crash when a sub..."

trunk/src/content/browser/renderer_host/render_view_host_impl.cc

Index: trunk/src/content/browser/renderer_host/render_view_host_impl.cc
===================================================================
--- trunk/src/content/browser/renderer_host/render_view_host_impl.cc	(revision 251088)
+++ trunk/src/content/browser/renderer_host/render_view_host_impl.cc	(working copy)
@@ -1431,9 +1431,11 @@
   render_view_termination_status_ =
       static_cast<base::TerminationStatus>(status);
 
-  // Reset frame tree state associated with this process.
+  // Reset frame tree state.
+  // TODO(creis): Once subframes can be in different processes, we'll need to
+  // clear just the FrameTreeNodes affected by the crash (and their subtrees).
   main_frame_id_ = -1;
-  delegate_->GetFrameTree()->RenderProcessGone(this);
+  delegate_->GetFrameTree()->ResetForMainFrameSwap();
 
   // Our base class RenderWidgetHost needs to reset some stuff.
   RendererExited(render_view_termination_status_, exit_code);