More Aura fixes to build with chromeos==1

chrome/browser/chromeos/setting_level_bubble.cc

Index: chrome/browser/chromeos/setting_level_bubble.cc
diff --git a/chrome/browser/chromeos/setting_level_bubble.cc b/chrome/browser/chromeos/setting_level_bubble.cc
index dbddb0cf81c34e256ab13dc7ba67ab0a024ed79d..bb8df2362e4adcf2320bb95217fb29f28b764efb 100644
--- a/chrome/browser/chromeos/setting_level_bubble.cc
+++ b/chrome/browser/chromeos/setting_level_bubble.cc
@@ -6,8 +6,6 @@
 
 #include <algorithm>
 
-#include <gdk/gdk.h>
-
 #include "chrome/browser/chromeos/login/background_view.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
 #include "chrome/browser/chromeos/login/webui_login_display.h"
@@ -127,7 +125,7 @@ void SettingLevelBubble::ShowBubble(double percent, bool enabled) {
     // specifies the center of the bubble).
     const gfx::Rect monitor_area =
         gfx::Screen::GetMonitorAreaNearestWindow(
-            GTK_WIDGET(parent_widget->GetNativeWindow()));
+            parent_widget->GetNativeView());
     const gfx::Size view_size = view_->GetPreferredSize();
     const gfx::Rect position_relative_to(
         monitor_area.x() + kBubbleXRatio * monitor_area.width(),