Revert of Drop CreateChildFrame messages when swapping out.

content/browser/frame_host/frame_tree_node.cc

Index: content/browser/frame_host/frame_tree_node.cc
diff --git a/content/browser/frame_host/frame_tree_node.cc b/content/browser/frame_host/frame_tree_node.cc
index 9170eca6186a39552e61d66769fd83969effa04f..180d8461cb00cc3d930b5a661e097aec6c34612b 100644
--- a/content/browser/frame_host/frame_tree_node.cc
+++ b/content/browser/frame_host/frame_tree_node.cc
@@ -42,11 +42,7 @@
 }
 
 void FrameTreeNode::AddChild(scoped_ptr<FrameTreeNode> child,
-                             int process_id,
                              int frame_routing_id) {
-  // Child frame must always be created in the same process as the parent.
-  CHECK_EQ(process_id, render_manager_.current_host()->GetProcess()->GetID());
-
   // Initialize the RenderFrameHost for the new node.  We always create child
   // frames in the same SiteInstance as the current frame, and they can swap to
   // a different one if they navigate away.