PlzNavigate: Create the speculative renderer earlier.

content/browser/frame_host/navigator_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 98 matching lines @@
     const GURL& url);
 
   // PlzNavigate: if needed, sends a BeforeUnload IPC to the renderer to ask it
   // to execute the beforeUnload event. Otherwise, the navigation request will
   // be started.
   void RequestNavigation(FrameTreeNode* frame_tree_node,
                          const NavigationEntryImpl& entry,
                          NavigationController::ReloadType reload_type,
                          base::TimeTicks navigation_start);
 
-  // PlzNavigate: sends the NavigationRequest for |frame_tree_node| to the
-  // network stack so that it can start.
-  void BeginNavigation(FrameTreeNode* frame_tree_node);
-
   void RecordNavigationMetrics(
       const LoadCommittedDetails& details,
       const FrameHostMsg_DidCommitProvisionalLoad_Params& params,
       SiteInstance* site_instance);
 
   // Called when a navigation has started in a main frame, to update the pending
   // NavigationEntry if the controller does not currently have a
   // browser-initiated one.
   void DidStartMainFrameNavigation(const GURL& url,
                                    SiteInstanceImpl* site_instance);
 
   // The NavigationController that will keep track of session history for all
   // RenderFrameHost objects using this NavigatorImpl.
   // TODO(nasko): Move ownership of the NavigationController from
   // WebContentsImpl to this class.
   NavigationControllerImpl* controller_;
 
   // Used to notify the object embedding this Navigator about navigation
   // events. Can be NULL in tests.
   NavigatorDelegate* delegate_;
 
   scoped_ptr<NavigatorImpl::NavigationMetricsData> navigation_data_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigatorImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_