Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/renderer_host/frame_tree.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/frame_tree.h"
 
 #include <queue>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "content/browser/renderer_host/frame_tree_node.h"
+#include "content/browser/renderer_host/navigator.h"
 #include "content/browser/renderer_host/render_frame_host_impl.h"
 
 namespace content {
 
 namespace {
 // Used with FrameTree::ForEach() to search for the FrameTreeNode
 // corresponding to |frame_id|.
 bool FrameTreeNodeForId(int64 frame_id, FrameTreeNode** out_node,
                         FrameTreeNode* node) {
   if (node->frame_id() == frame_id) {
     *out_node = node;
     // Terminate iteration once the node has been found.
     return false;
   }
   return true;
 }
 
 }  // namespace
 
-FrameTree::FrameTree()
-    : root_(new FrameTreeNode(FrameTreeNode::kInvalidFrameId, std::string(),
-                              scoped_ptr<RenderFrameHostImpl>())) {
+FrameTree::FrameTree() {}
+
+void FrameTree::Init(
+    NavigationControllerImpl* navigation_controller,
+    NavigatorObserver* navigator_observer) {
+  navigator_.reset(new Navigator(navigation_controller, navigator_observer));
+  root_.reset(new FrameTreeNode(navigator_.get(),
+                                FrameTreeNode::kInvalidFrameId, std::string(),
+                                scoped_ptr<RenderFrameHostImpl>()));
 }
 
 FrameTree::~FrameTree() {
 }
 
 FrameTreeNode* FrameTree::FindByID(int64 frame_id) {
   FrameTreeNode* node = NULL;
   ForEach(base::Bind(&FrameTreeNodeForId, frame_id, &node));
   return node;
 }
@@ skipping 80 matching lines @@
   on_frame_removed_ = on_frame_removed;
 }
 
 scoped_ptr<FrameTreeNode> FrameTree::CreateNode(
     int64 frame_id, const std::string& frame_name, int render_frame_host_id,
     RenderProcessHost* render_process_host) {
   scoped_ptr<RenderFrameHostImpl> render_frame_host(
       new RenderFrameHostImpl(root_->render_frame_host()->render_view_host(),
                               this, render_frame_host_id, false));
 
-  return make_scoped_ptr(new FrameTreeNode(frame_id, frame_name,
+  return make_scoped_ptr(new FrameTreeNode(navigator_.get(),
+                                           frame_id, frame_name,
                                            render_frame_host.Pass()));
 }
 
 }  // namespace content