Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

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 9bed9f699ecc57edde996cde2dcb18f3c7b96ed2..df6e7f1ff8351e0a7009c7d0a7f13340b50b0e37 100644
--- a/content/browser/frame_host/frame_tree_node.cc
+++ b/content/browser/frame_host/frame_tree_node.cc
@@ -7,18 +7,25 @@
 #include <queue>
 
 #include "base/stl_util.h"
+#include "content/browser/frame_host/navigator.h"
+#include "content/browser/frame_host/navigator_delegate.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 
 namespace content {
 
 const int64 FrameTreeNode::kInvalidFrameId = -1;
 
-FrameTreeNode::FrameTreeNode(int64 frame_id, const std::string& name,
-                             scoped_ptr<RenderFrameHostImpl> render_frame_host)
-  : frame_id_(frame_id),
-    frame_name_(name),
-    owns_render_frame_host_(true),
-    render_frame_host_(render_frame_host.release()) {
+FrameTreeNode::FrameTreeNode(
+    NavigationControllerImpl* navigation_controller,
+    NavigatorDelegate* navigator_delegate,
+    int64 frame_id,
+    const std::string& name,
+    scoped_ptr<RenderFrameHostImpl> render_frame_host)
+    : frame_id_(frame_id),
+      frame_name_(name),
+      navigator_(navigation_controller, navigator_delegate),
+      owns_render_frame_host_(true),
+      render_frame_host_(render_frame_host.release()) {
 }
 
 FrameTreeNode::~FrameTreeNode() {