Add stubs for brailleDisplayPrivate extension API.

chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc

Index: chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
diff --git a/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc b/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
index 553bfefd729dea89abd03d55dcdb024472c391cd..4052d82e1c1af0e69f942bbcce08bcccb9788f8b 100644
--- a/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
+++ b/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
@@ -22,6 +22,7 @@
 #include "chrome/browser/extensions/api/audio/audio_api.h"
 #include "chrome/browser/extensions/api/bluetooth/bluetooth_api_factory.h"
 #include "chrome/browser/extensions/api/bookmarks/bookmarks_api.h"
+#include "chrome/browser/extensions/api/braille_display_private/braille_display_private_api.h"
 #include "chrome/browser/extensions/api/commands/command_service.h"
 #include "chrome/browser/extensions/api/cookies/cookies_api.h"
 #include "chrome/browser/extensions/api/developer_private/developer_private_api_factory.h"
@@ -213,6 +214,7 @@ EnsureBrowserContextKeyedServiceFactoriesBuilt() {
   extensions::AudioAPI::GetFactoryInstance();
   extensions::BookmarksAPI::GetFactoryInstance();
   extensions::BluetoothAPIFactory::GetInstance();
+  extensions::BrailleDisplayPrivateAPI::GetFactoryInstance();
   extensions::chromedirectsetting::ChromeDirectSettingAPI::GetFactoryInstance();
   extensions::CommandService::GetFactoryInstance();
   extensions::CookiesAPI::GetFactoryInstance();