Convert PrerenderContents to use the new navigation callbacks.

content/browser/frame_host/navigation_handle_impl.cc

 // 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.
 
 #include "content/browser/frame_host/navigation_handle_impl.h"
 
 #include <iterator>
 
 #include "base/debug/dump_without_crashing.h"
 #include "base/logging.h"
@@ skipping 175 matching lines @@
 }
 
 bool NavigationHandleImpl::IsRendererInitiated() {
   return is_renderer_initiated_;
 }
 
 bool NavigationHandleImpl::WasServerRedirect() {
   return was_redirected_;
 }
 
+const std::vector<GURL>& NavigationHandleImpl::GetRedirectChain() {
+  return redirect_chain_;
+}
+
 int NavigationHandleImpl::GetFrameTreeNodeId() {
   return frame_tree_node_->frame_tree_node_id();
 }
 
 int NavigationHandleImpl::GetParentFrameTreeNodeId() {
   if (frame_tree_node_->IsMainFrame())
     return FrameTreeNode::kFrameTreeNodeInvalidId;
 
   return frame_tree_node_->parent()->frame_tree_node_id();
 }
@@ skipping 624 matching lines @@
       content::AncestorThrottle::MaybeCreateThrottleFor(this);
   if (ancestor_throttle)
     throttles_.push_back(std::move(ancestor_throttle));
 
   throttles_.insert(throttles_.begin(),
                     std::make_move_iterator(throttles_to_register.begin()),
                     std::make_move_iterator(throttles_to_register.end()));
 }
 
 }  // namespace content