Added Setters to NavigationContextImpl.

ios/web/web_state/navigation_context_impl.mm

Index: ios/web/web_state/navigation_context_impl.mm
diff --git a/ios/web/web_state/navigation_context_impl.mm b/ios/web/web_state/navigation_context_impl.mm
index 4d6406f8dd94c796bc1cbe30794711c3d405b6fd..39df2fa68ea4f649af5bdadf219b39e19787f8ae 100644
--- a/ios/web/web_state/navigation_context_impl.mm
+++ b/ios/web/web_state/navigation_context_impl.mm
@@ -13,6 +13,16 @@ namespace web {
 
 // static
 std::unique_ptr<NavigationContextImpl>
+NavigationContextImpl::CreateNavigationContext(WebState* web_state,
+                                               const GURL& url) {
+  std::unique_ptr<NavigationContextImpl> result(new NavigationContextImpl(
+      web_state, url, false /* is_same_document */, false /* is_error_page */,
+      nullptr /* response_headers */));
+  return result;
+}
+
+// static
+std::unique_ptr<NavigationContextImpl>
 NavigationContextImpl::CreateNavigationContext(
     WebState* web_state,
     const GURL& url,
@@ -76,6 +86,19 @@ net::HttpResponseHeaders* NavigationContextImpl::GetResponseHeaders() const {
   return response_headers_.get();
 }
 
+void NavigationContextImpl::SetIsSameDocument(bool is_same_document) {
+  is_same_document_ = is_same_document;
+}
+
+void NavigationContextImpl::SetIsErrorPage(bool is_error_page) {
+  is_error_page_ = is_error_page;
+}
+
+void NavigationContextImpl::SetResponseHeaders(
+    const scoped_refptr<net::HttpResponseHeaders>& response_headers) {
+  response_headers_ = response_headers;
+}
+
 NavigationContextImpl::NavigationContextImpl(
     WebState* web_state,
     const GURL& url,