Revert of Dispatch unload event for swapped-out subframes.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 93c58f5fdd111ae8a60a6ed921482cc86d0eb5a5..e1255bcb9e18bed22dca2c2eaa1ab4ba914e0f19 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1790,6 +1790,12 @@
   proxy = RenderFrameProxy::CreateProxyToReplaceFrame(
       this, proxy_routing_id, replicated_frame_state.scope);
 
+  // Synchronously run the unload handler before sending the ACK.
+  // TODO(creis): Call dispatchUnloadEvent unconditionally here to support
+  // unload on subframes as well.
+  if (is_main_frame_)
+    frame_->DispatchUnloadEvent();
+
   // Swap out and stop sending any IPC messages that are not ACKs.
   if (is_main_frame_)
     render_view_->SetSwappedOut(true);