Add the navigation redirect-chain to Sync sessions proto for offline analysis.

content/browser/frame_host/navigator_impl.cc

Index: content/browser/frame_host/navigator_impl.cc
diff --git a/content/browser/frame_host/navigator_impl.cc b/content/browser/frame_host/navigator_impl.cc
index f01dc531fca5073272ebf8e64a56d9a65e265bc1..bcedb6564e44959bc12c9b8bd7feb0367aa3e79b 100644
--- a/content/browser/frame_host/navigator_impl.cc
+++ b/content/browser/frame_host/navigator_impl.cc
@@ -105,7 +105,13 @@ void MakeNavigateParams(const NavigationEntryImpl& entry,
             entry.GetBrowserInitiatedPostData()->size());
   }
 
-  params->redirects = entry.redirect_chain();
+  // Set the redirect chain to the navigation's redirects, unless we are
+  // returning to a completed navigation (whose previous redirects don't apply).
+  if (PageTransitionIsNewNavigation(params->transition)) {
+    params->redirects = entry.GetRedirectChain();
+  } else {
+    params->redirects = std::vector<GURL>();
+  }
 
   params->can_load_local_resources = entry.GetCanLoadLocalResources();
   params->frame_to_navigate = entry.GetFrameToNavigate();
@@ -168,7 +174,7 @@ void NavigatorImpl::DidStartProvisionalLoad(
         entry->set_transferred_global_request_id(
             pending_entry->transferred_global_request_id());
         entry->set_should_replace_entry(pending_entry->should_replace_entry());
-        entry->set_redirect_chain(pending_entry->redirect_chain());
+        entry->SetRedirectChain(pending_entry->GetRedirectChain());
       }
       controller_->SetPendingEntry(entry);
       if (delegate_)