Refactor serialisation of openerId & openerNavigationIndex.

ios/web/navigation/navigation_manager_impl.mm

 // 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.
 
 #import "ios/web/navigation/navigation_manager_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 77 matching lines @@
   [session_controller_ setBrowserState:browser_state];
 }
 
 void NavigationManagerImpl::SetSessionController(
     CRWSessionController* session_controller) {
   session_controller_.reset(session_controller);
   [session_controller_ setNavigationManager:this];
 }
 
 void NavigationManagerImpl::InitializeSession(NSString* window_name,
-                                              NSString* opener_id,
-                                              BOOL opened_by_dom,
-                                              int opener_navigation_index) {
+                                              BOOL opened_by_dom) {
   SetSessionController([[CRWSessionController alloc]
          initWithWindowName:window_name
-                   openerId:opener_id
                 openedByDOM:opened_by_dom
-      openerNavigationIndex:opener_navigation_index
                browserState:browser_state_]);
 }
 
 void NavigationManagerImpl::ReplaceSessionHistory(
     std::vector<std::unique_ptr<web::NavigationItem>> items,
     int current_index) {
   SetSessionController([[CRWSessionController alloc]
       initWithNavigationItems:std::move(items)
                  currentIndex:current_index
                  browserState:browser_state_]);
@@ skipping 299 matching lines @@
 }
 
 bool NavigationManagerImpl::IsRedirectItemAtIndex(int index) const {
   DCHECK_GT(index, 0);
   DCHECK_LT(index, GetItemCount());
   ui::PageTransition transition = GetItemAtIndex(index)->GetTransitionType();
   return transition & ui::PAGE_TRANSITION_IS_REDIRECT_MASK;
 }
 
 }  // namespace web