Moves maintaining root_window_for_new_windows_ to Shell

chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
index 7a473e041830316b61cb431dbca1fc6668cae753..db6a15cac37be2cbc4564d2142e84d7a74302835 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
@@ -372,7 +372,7 @@ class ShelfAppBrowserTest : public ExtensionBrowserTest {
   }
 
   aura::Window* CurrentContext() {
-    aura::Window* root_window = ash::Shell::GetTargetRootWindow();
+    aura::Window* root_window = ash::Shell::GetRootWindowForNewWindows();
     DCHECK(root_window);
     return root_window;
   }