Replaced NavigationContext::IsErrorPage with NavigationContext::GetError

ios/web/public/test/fakes/crw_test_web_state_observer.mm

Index: ios/web/public/test/fakes/crw_test_web_state_observer.mm
diff --git a/ios/web/public/test/fakes/crw_test_web_state_observer.mm b/ios/web/public/test/fakes/crw_test_web_state_observer.mm
index 36eb86f36d2490257f3d11949463b7fe0a47d412..51280fb46a3a8d6725367f3c2184f5cff300d8df 100644
--- a/ios/web/public/test/fakes/crw_test_web_state_observer.mm
+++ b/ios/web/public/test/fakes/crw_test_web_state_observer.mm
@@ -5,8 +5,8 @@
 #import "ios/web/public/test/fakes/crw_test_web_state_observer.h"
 
 #include "base/memory/ptr_util.h"
-#include "ios/web/public/web_state/navigation_context.h"
-#include "ios/web/web_state/navigation_context_impl.h"
+#import "ios/web/public/web_state/navigation_context.h"
+#import "ios/web/web_state/navigation_context_impl.h"
 #include "net/http/http_response_headers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -127,14 +127,14 @@ TestUpdateFaviconUrlCandidatesInfo::~TestUpdateFaviconUrlCandidatesInfo() =
 
 - (void)webState:(web::WebState*)webState
     didStartNavigation:(web::NavigationContext*)navigation {
-  ASSERT_TRUE(!navigation->IsErrorPage() || !navigation->IsSameDocument());
+  ASSERT_TRUE(!navigation->GetError() || !navigation->IsSameDocument());
   _didStartNavigationInfo = base::MakeUnique<web::TestDidStartNavigationInfo>();
   _didStartNavigationInfo->web_state = webState;
   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());
   _didStartNavigationInfo->context = std::move(context);
 }
 
@@ -148,7 +148,7 @@ TestUpdateFaviconUrlCandidatesInfo::~TestUpdateFaviconUrlCandidatesInfo() =
 
 - (void)webState:(web::WebState*)webState
     didFinishNavigation:(web::NavigationContext*)navigation {
-  ASSERT_TRUE(!navigation->IsErrorPage() || !navigation->IsSameDocument());
+  ASSERT_TRUE(!navigation->GetError() || !navigation->IsSameDocument());
   _didFinishNavigationInfo =
       base::MakeUnique<web::TestDidFinishNavigationInfo>();
   _didFinishNavigationInfo->web_state = webState;
@@ -156,7 +156,7 @@ TestUpdateFaviconUrlCandidatesInfo::~TestUpdateFaviconUrlCandidatesInfo() =
       web::NavigationContextImpl::CreateNavigationContext(
           navigation->GetWebState(), navigation->GetUrl());
   context->SetIsSameDocument(navigation->IsSameDocument());
-  context->SetIsErrorPage(navigation->IsErrorPage());
+  context->SetError(navigation->GetError());
   _didFinishNavigationInfo->context = std::move(context);
 }