RenderFrameDevToolsAgentHost uses new navigation observer API.

content/browser/frame_host/navigation_handle_impl.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_
 
 #include "content/public/browser/navigation_handle.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
+#include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_throttle.h"
 #include "url/gurl.h"
 
 namespace content {
 
 class NavigatorDelegate;
 class ServiceWorkerNavigationHandle;
 struct NavigationRequestInfo;
@@ skipping 123 matching lines @@
   // |callback| will be called when all throttles check have completed. This
   // will allow the caller to cancel the navigation or let it proceed.
   void WillRedirectRequest(
       const GURL& new_url,
       bool new_method_is_post,
       const GURL& new_referrer_url,
       bool new_is_external_protocol,
       scoped_refptr<net::HttpResponseHeaders> response_headers,
       const ThrottleChecksFinishedCallback& callback);
 
+  // Returns the FrameTreeNode this navigation is happening in.
+  FrameTreeNode* frame_tree_node() { return frame_tree_node_; }
+
   // Called when the navigation was redirected. This will update the |url_| and
   // inform the delegate.
   void DidRedirectNavigation(const GURL& new_url);
 
   // Called when the navigation is ready to be committed in
   // |render_frame_host|. This will update the |state_| and inform the
   // delegate.
   void ReadyToCommitNavigation(
       RenderFrameHostImpl* render_frame_host,
       scoped_refptr<net::HttpResponseHeaders> response_headers);
@@ skipping 71 matching lines @@
   // Manages the lifetime of a pre-created ServiceWorkerProviderHost until a
   // corresponding ServiceWorkerNetworkProvider is created in the renderer.
   scoped_ptr<ServiceWorkerNavigationHandle> service_worker_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationHandleImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_HANDLE_IMPL_H_