Replaced NavigationContext::IsErrorPage with NavigationContext::GetError

ios/web/public/test/fakes/test_web_state_observer.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.
 
 #include "ios/web/public/test/fakes/test_web_state_observer.h"
 
 #include "base/memory/ptr_util.h"
-#include "ios/web/public/web_state/navigation_context.h"
+#import "ios/web/public/web_state/navigation_context.h"
 #include "ios/web/public/web_state/web_state.h"
 #include "ios/web/web_state/navigation_context_impl.h"
 #include "net/http/http_response_headers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace web {
 
 TestWebStateObserver::TestWebStateObserver(WebState* web_state)
     : WebStateObserver(web_state) {}
 TestWebStateObserver::~TestWebStateObserver() = default;
@@ skipping 33 matching lines @@
   navigation_items_pruned_info_->count = pruned_item_count;
 }
 
 void TestWebStateObserver::NavigationItemChanged() {
   navigation_item_changed_info_ =
       base::MakeUnique<web::TestNavigationItemChangedInfo>();
   navigation_item_changed_info_->web_state = web_state();
 }
 
 void TestWebStateObserver::DidStartNavigation(NavigationContext* navigation) {
-  ASSERT_TRUE(!navigation->IsErrorPage() || !navigation->IsSameDocument());
+  ASSERT_TRUE(!navigation->GetError() || !navigation->IsSameDocument());
   did_start_navigation_info_ =
       base::MakeUnique<web::TestDidStartNavigationInfo>();
   did_start_navigation_info_->web_state = web_state();
   std::unique_ptr<web::NavigationContextImpl> context =
       web::NavigationContextImpl::CreateNavigationContext(
           navigation->GetWebState(), navigation->GetUrl());
   context->SetIsSameDocument(navigation->IsSameDocument());
-  context->SetIsErrorPage(navigation->IsErrorPage());
+  context->SetError(navigation->GetError());
   did_start_navigation_info_->context = std::move(context);
 }
 
 void TestWebStateObserver::DidFinishNavigation(NavigationContext* navigation) {
-  ASSERT_TRUE(!navigation->IsErrorPage() || !navigation->IsSameDocument());
+  ASSERT_TRUE(!navigation->GetError() || !navigation->IsSameDocument());
   did_finish_navigation_info_ =
       base::MakeUnique<web::TestDidFinishNavigationInfo>();
   did_finish_navigation_info_->web_state = web_state();
   std::unique_ptr<web::NavigationContextImpl> context =
       web::NavigationContextImpl::CreateNavigationContext(
           navigation->GetWebState(), navigation->GetUrl());
   context->SetIsSameDocument(navigation->IsSameDocument());
-  context->SetIsErrorPage(navigation->IsErrorPage());
+  context->SetError(navigation->GetError());
   did_finish_navigation_info_->context = std::move(context);
 }
 
 void TestWebStateObserver::TitleWasSet() {
   title_was_set_info_ = base::MakeUnique<web::TestTitleWasSetInfo>();
   title_was_set_info_->web_state = web_state();
 }
 
 void TestWebStateObserver::DidChangeVisibleSecurityState() {
   did_change_visible_security_state_info_ =
@@ skipping 55 matching lines @@
   start_loading_info_ = base::MakeUnique<web::TestStartLoadingInfo>();
   start_loading_info_->web_state = web_state();
 }
 
 void TestWebStateObserver::DidStopLoading() {
   stop_loading_info_ = base::MakeUnique<web::TestStopLoadingInfo>();
   stop_loading_info_->web_state = web_state();
 }
 
 }  // namespace web