[Navigation Experiment] Add WKBasedNavigationManagerImpl.

ios/web/navigation/legacy_navigation_manager_impl.mm

 // Copyright 2017 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/legacy_navigation_manager_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 22 matching lines @@
   if (existing_url == new_url || !new_url.has_ref())
     return false;
 
   return existing_url.EqualsIgnoringRef(new_url);
 }
 
 }  // anonymous namespace
 
 namespace web {
 
-NavigationManager::WebLoadParams::WebLoadParams(const GURL& url)
-    : url(url),
-      transition_type(ui::PAGE_TRANSITION_LINK),
-      user_agent_override_option(UserAgentOverrideOption::INHERIT),
-      is_renderer_initiated(false),
-      post_data(nil) {}
-
-NavigationManager::WebLoadParams::~WebLoadParams() {}
-
-NavigationManager::WebLoadParams::WebLoadParams(const WebLoadParams& other)
-    : url(other.url),
-      referrer(other.referrer),
-      transition_type(other.transition_type),
-      user_agent_override_option(other.user_agent_override_option),
-      is_renderer_initiated(other.is_renderer_initiated),
-      extra_headers([other.extra_headers copy]),
-      post_data([other.post_data copy]) {}
-
-NavigationManager::WebLoadParams& NavigationManager::WebLoadParams::operator=(
-    const WebLoadParams& other) {
-  url = other.url;
-  referrer = other.referrer;
-  is_renderer_initiated = other.is_renderer_initiated;
-  transition_type = other.transition_type;
-  user_agent_override_option = other.user_agent_override_option;
-  extra_headers.reset([other.extra_headers copy]);
-  post_data.reset([other.post_data copy]);
-
-  return *this;
-}
-
 LegacyNavigationManagerImpl::LegacyNavigationManagerImpl()
     : delegate_(nullptr), browser_state_(nullptr) {}
 
 LegacyNavigationManagerImpl::~LegacyNavigationManagerImpl() {
   [session_controller_ setNavigationManager:nullptr];
 }
 
 void LegacyNavigationManagerImpl::SetDelegate(
     NavigationManagerDelegate* delegate) {
   delegate_ = delegate;
@@ skipping 370 matching lines @@
       return item;
   }
   return nullptr;
 }
 
 int LegacyNavigationManagerImpl::GetPreviousItemIndex() const {
   return base::checked_cast<int>([session_controller_ previousItemIndex]);
 }
 
 }  // namespace web