Implement chrome://network-error with network service.

content/browser/webui/web_ui_url_loader_factory.cc

Index: content/browser/webui/web_ui_url_loader_factory.cc
diff --git a/content/browser/webui/web_ui_url_loader_factory.cc b/content/browser/webui/web_ui_url_loader_factory.cc
index a6ba11d35876de3c0d4e0d1f947eda9eedc03bac..d73b5167a2eccd908bf98b3ab97c82187e4ce2a8 100644
--- a/content/browser/webui/web_ui_url_loader_factory.cc
+++ b/content/browser/webui/web_ui_url_loader_factory.cc
@@ -17,6 +17,7 @@
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/histogram_internals_url_loader.h"
 #include "content/browser/resource_context_impl.h"
+#include "content/browser/webui/network_error_url_loader.h"
 #include "content/browser/webui/url_data_manager_backend.h"
 #include "content/browser/webui/url_data_source_impl.h"
 #include "content/public/browser/browser_context.h"
@@ -248,6 +249,10 @@ class WebUIURLLoaderFactory : public mojom::URLLoaderFactory,
               base::Unretained(
                   ChromeBlobStorageContext::GetFor(browser_context_))));
       return;
+    } else if (request.url.host_piece() == kChromeUINetworkErrorHost ||
+               request.url.host_piece() == kChromeUIDinoHost) {
+      StartNetworkErrorsURLLoader(request, std::move(client));
+      return;
     } else if (request.url.host_piece() == kChromeUIHistogramHost) {
       StartHistogramInternalsURLLoader(request, std::move(client));
       return;