Replaced NavigationContext::IsErrorPage with NavigationContext::GetError

ios/web/webui/crw_web_ui_manager.mm

 // 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.
 
 #import "ios/web/webui/crw_web_ui_manager.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/json/string_escape.h"
 #import "base/mac/bind_objc_block.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/stringprintf.h"
 #import "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "ios/web/grit/ios_web_resources.h"
 #include "ios/web/public/browser_state.h"
 #import "ios/web/public/web_client.h"
-#include "ios/web/public/web_state/navigation_context.h"
+#import "ios/web/public/web_state/navigation_context.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #import "ios/web/web_state/web_state_impl.h"
 #import "ios/web/webui/crw_web_ui_page_builder.h"
 #include "ios/web/webui/mojo_js_constants.h"
 #import "ios/web/webui/url_fetcher_block_adapter.h"
 #include "mojo/public/js/constants.h"
 #import "net/base/mac/url_conversions.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ skipping 282 matching lines @@
 #pragma mark - Testing-Only Methods
 
 - (std::unique_ptr<web::URLFetcherBlockAdapter>)
     fetcherForURL:(const GURL&)URL
 completionHandler:(web::URLFetcherBlockAdapterCompletion)handler {
   return base::MakeUnique<web::URLFetcherBlockAdapter>(
       URL, _webState->GetBrowserState()->GetRequestContext(), handler);
 }
 
 @end