Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/frame_host/frame_tree.cc

Index: content/browser/frame_host/frame_tree.cc
diff --git a/content/browser/frame_host/frame_tree.cc b/content/browser/frame_host/frame_tree.cc
index 92818c874b9910d30e23a519e590770e6473c8e2..8ec5c0e867316df8ce6035cf1825c4d0a5832998 100644
--- a/content/browser/frame_host/frame_tree.cc
+++ b/content/browser/frame_host/frame_tree.cc
@@ -55,8 +55,7 @@ FrameTree::FrameTree(Navigator* navigator,
                               render_widget_delegate,
                               manager_delegate,
                               FrameTreeNode::kInvalidFrameId,
-                              std::string(),
-                              scoped_ptr<RenderFrameHostImpl>())) {
+                              std::string())) {
 }
 
 FrameTree::~FrameTree() {
@@ -166,16 +165,17 @@ scoped_ptr<FrameTreeNode> FrameTree::CreateNode(
     int render_frame_host_id,
     Navigator* navigator,
     RenderProcessHost* render_process_host) {
+  scoped_ptr<FrameTreeNode> frame_tree_node(new FrameTreeNode(navigator,
+      render_view_delegate_, render_widget_delegate_, manager_delegate_,
+      frame_id, frame_name));
+
   scoped_ptr<RenderFrameHostImpl> render_frame_host(
       RenderFrameHostFactory::Create(
           root_->render_frame_host()->render_view_host(),
-          this,
-          render_frame_host_id,
-          false));
+          this, frame_tree_node.get(), render_frame_host_id, false));
 
-  return make_scoped_ptr(new FrameTreeNode(navigator,
-      render_view_delegate_, render_widget_delegate_, manager_delegate_,
-      frame_id, frame_name, render_frame_host.Pass()));
+  frame_tree_node->set_render_frame_host(render_frame_host.release(), true);
+  return frame_tree_node.Pass();
 }
 
 }  // namespace content