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..810545a2a0aa9c2382b2b038000830a8a3735199 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"
@@ -29,6 +32,10 @@ views::Widget* CreateWindowAsFramelessChild(views::WidgetDelegate* delegate,
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 
   widget->Init(params);
+
+  widget->SetThemeProvider(ThemeServiceFactory::GetForProfile(
+      ProfileManager::GetActiveUserProfile()));
+
   return widget;
 }