Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/frame_host/render_frame_host_factory.h

Index: content/browser/frame_host/render_frame_host_factory.h
diff --git a/content/browser/frame_host/render_frame_host_factory.h b/content/browser/frame_host/render_frame_host_factory.h
index b851b62743f81b786c7a4ee42b103f86e2969c5a..c2bd5e9b2cd723b5d935fa5ca67682cd6214f524 100644
--- a/content/browser/frame_host/render_frame_host_factory.h
+++ b/content/browser/frame_host/render_frame_host_factory.h
@@ -12,6 +12,7 @@
 namespace content {
 
 class FrameTree;
+class FrameTreeNode;
 class RenderFrameHostImpl;
 class RenderViewHostImpl;
 
@@ -25,6 +26,7 @@ class CONTENT_EXPORT RenderFrameHostFactory {
   static scoped_ptr<RenderFrameHostImpl> Create(
       RenderViewHostImpl* render_view_host,
       FrameTree* frame_tree,
+      FrameTreeNode* frame_tree_node,
       int routing_id,
       bool is_swapped_out);
 
@@ -40,6 +42,7 @@ class CONTENT_EXPORT RenderFrameHostFactory {
   virtual scoped_ptr<RenderFrameHostImpl> CreateRenderFrameHost(
       RenderViewHostImpl* render_view_host,
       FrameTree* frame_tree,
+      FrameTreeNode* frame_tree_node,
       int routing_id,
       bool is_swapped_out) = 0;