Add ability for Widgets to override the DefaultThemeProvider

chrome/browser/chromeos/login/ui/captive_portal_window_proxy.cc

Index: chrome/browser/chromeos/login/ui/captive_portal_window_proxy.cc
diff --git a/chrome/browser/chromeos/login/ui/captive_portal_window_proxy.cc b/chrome/browser/chromeos/login/ui/captive_portal_window_proxy.cc
index 9acc39021941f8b9f5a1887e4f015941050f257b..7dca99a760db775affc29effe7289530e2e2c0ad 100644
--- a/chrome/browser/chromeos/login/ui/captive_portal_window_proxy.cc
+++ b/chrome/browser/chromeos/login/ui/captive_portal_window_proxy.cc
@@ -8,6 +8,9 @@
 #include "chrome/browser/chromeos/login/ui/captive_portal_view.h"
 #include "chrome/browser/chromeos/login/ui/proxy_settings_dialog.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/themes/theme_service.h"
+#include "chrome/browser/themes/theme_service_factory.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
@@ -27,6 +30,8 @@ views::Widget* CreateWindowAsFramelessChild(views::WidgetDelegate* delegate,
   params.parent = parent;
   params.remove_standard_frame = true;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
+  params.theme_provider = ThemeServiceFactory::GetForProfile(
+      ProfileManager::GetActiveUserProfile());
 
   widget->Init(params);
   return widget;