diff --git chrome/browser/ui/BUILD.gn chrome/browser/ui/BUILD.gn
index e5811d45bd4b6..4f532d65e963f 100644
--- chrome/browser/ui/BUILD.gn
+++ chrome/browser/ui/BUILD.gn
@@ -11,6 +11,7 @@ import("//build/config/features.gni")
 import("//build/config/linux/gtk/gtk.gni")
 import("//build/config/ozone.gni")
 import("//build/config/ui.gni")
+import("//cef/libcef/features/features.gni")
 import("//chrome/browser/buildflags.gni")
 import("//chrome/common/features.gni")
 import("//chromeos/assistant/assistant.gni")
@@ -347,6 +348,10 @@ static_library("ui") {
     "//build/config/compiler:wexit_time_destructors",
   ]
 
+  if (enable_cef) {
+    configs += [ "//cef/libcef/features:config" ]
+  }
+
   # Since browser and browser_ui actually depend on each other,
   # we must omit the dependency from browser_ui to browser.
   # However, this means browser_ui and browser should more or less
@@ -369,6 +374,7 @@ static_library("ui") {
     "//build:branding_buildflags",
     "//build:chromeos_buildflags",
     "//cc/paint",
+    "//cef/libcef/features",
     "//chrome:extra_resources",
     "//chrome:resources",
     "//chrome:strings",
@@ -4984,6 +4990,7 @@ static_library("ui") {
   if (enable_basic_printing) {
     deps += [
       "//components/printing/browser",
+      "//components/printing/common:mojo_interfaces",
       "//printing",
     ]
   }
diff --git chrome/browser/ui/webui/net_export_ui.cc chrome/browser/ui/webui/net_export_ui.cc
index 096f4ca97179d..d2c731625b9d6 100644
--- chrome/browser/ui/webui/net_export_ui.cc
+++ chrome/browser/ui/webui/net_export_ui.cc
@@ -22,6 +22,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "build/build_config.h"
+#include "cef/libcef/features/runtime.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/net/net_export_helper.h"
@@ -45,6 +46,10 @@
 #include "net/log/net_log_capture_mode.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
+#if BUILDFLAG(ENABLE_CEF)
+#include "cef/libcef/browser/alloy/alloy_dialog_util.h"
+#endif
+
 #if defined(OS_ANDROID)
 #include "chrome/browser/android/intent_helper.h"
 #endif
@@ -138,6 +143,13 @@ class NetExportMessageHandler
   // NetLog file.
   void ShowSelectFileDialog(const base::FilePath& default_path);
 
+#if BUILDFLAG(ENABLE_CEF)
+  void ShowCefSaveAsDialog(content::WebContents* web_contents);
+  void SaveAsDialogDismissed(
+      int selected_accept_filter,
+      const std::vector<base::FilePath>& file_paths);
+#endif
+
   // Cached pointer to SystemNetworkContextManager's NetExportFileWriter.
   net_log::NetExportFileWriter* file_writer_;
 
@@ -233,6 +245,13 @@ void NetExportMessageHandler::OnStartNetLog(const base::ListValue* list) {
   if (UsingMobileUI()) {
     StartNetLog(base::FilePath());
   } else {
+#if BUILDFLAG(ENABLE_CEF)
+    if (cef::IsAlloyRuntimeEnabled()) {
+      ShowCefSaveAsDialog(web_ui()->GetWebContents());
+      return;
+    }
+#endif
+
     base::FilePath initial_dir = last_save_dir.Pointer()->empty() ?
         DownloadPrefs::FromBrowserContext(
             web_ui()->GetWebContents()->GetBrowserContext())->DownloadPath() :
@@ -249,6 +268,7 @@ void NetExportMessageHandler::OnStopNetLog(const base::ListValue* list) {
   std::unique_ptr<base::DictionaryValue> ui_thread_polled_data(
       new base::DictionaryValue());
 
+  if (!cef::IsAlloyRuntimeEnabled()) {
   Profile* profile = Profile::FromWebUI(web_ui());
   SetIfNotNull(ui_thread_polled_data.get(), "prerenderInfo",
                chrome_browser_net::GetPrerenderInfo(profile));
@@ -258,6 +278,7 @@ void NetExportMessageHandler::OnStopNetLog(const base::ListValue* list) {
   SetIfNotNull(ui_thread_polled_data.get(), "serviceProviders",
                chrome_browser_net::GetWindowsServiceProviders());
 #endif
+  }
 
   file_writer_->StopNetLog(std::move(ui_thread_polled_data));
 }
@@ -374,6 +395,38 @@ void NetExportMessageHandler::ShowSelectFileDialog(
       &file_type_info, 0, base::FilePath::StringType(), owning_window, nullptr);
 }
 
+#if BUILDFLAG(ENABLE_CEF)
+
+void NetExportMessageHandler::ShowCefSaveAsDialog(
+    content::WebContents* web_contents) {
+  base::FilePath initial_dir;
+  if (!last_save_dir.Pointer()->empty())
+    initial_dir = *last_save_dir.Pointer();
+  base::FilePath initial_path =
+      initial_dir.Append(FILE_PATH_LITERAL("chrome-net-export-log.json"));
+
+  blink::mojom::FileChooserParams params;
+  params.mode = blink::mojom::FileChooserParams::Mode::kSave;
+  params.default_file_name = initial_path;
+  params.accept_types.push_back(
+      alloy::FilePathTypeToString16(initial_path.Extension()));
+
+  alloy::RunFileChooser(web_contents, params,
+      base::BindOnce(&NetExportMessageHandler::SaveAsDialogDismissed,
+                     weak_ptr_factory_.GetWeakPtr()));
+}
+
+void NetExportMessageHandler::SaveAsDialogDismissed(
+    int selected_accept_filter,
+    const std::vector<base::FilePath>& file_paths) {
+  if (file_paths.size() == 1) {
+    *last_save_dir.Pointer() = file_paths[0].DirName();
+    StartNetLog(file_paths[0]);
+  }
+}
+
+#endif  // BUILDFLAG(ENABLE_CEF)
+
 }  // namespace
 
 NetExportUI::NetExportUI(content::WebUI* web_ui) : WebUIController(web_ui) {