Separate ash::test::DisplayManagerTestApi from ash

chrome/browser/chromeos/policy/force_maximize_on_first_run_chromeos_browsertest.cc

Index: chrome/browser/chromeos/policy/force_maximize_on_first_run_chromeos_browsertest.cc
diff --git a/chrome/browser/chromeos/policy/force_maximize_on_first_run_chromeos_browsertest.cc b/chrome/browser/chromeos/policy/force_maximize_on_first_run_chromeos_browsertest.cc
index deb6f6a9e967f87f3f74aba78871eadae7c2e795..45dd9ca73c51efd2eb6ad70ce1f99331ac9036bc 100644
--- a/chrome/browser/chromeos/policy/force_maximize_on_first_run_chromeos_browsertest.cc
+++ b/chrome/browser/chromeos/policy/force_maximize_on_first_run_chromeos_browsertest.cc
@@ -41,7 +41,9 @@ class ForceMaximizeOnFirstRunTest : public LoginPolicyTestBase {
         ash::WindowPositioner::GetForceMaximizedWidthLimit() + 100;
     // Set resolution to 1466x300.
     const std::string resolution = base::IntToString(width) + "x300";
-    ash::test::DisplayManagerTestApi().UpdateDisplay(resolution);
+    ash::test::DisplayManagerTestApi(
+        ash::Shell::GetInstance()->display_manager())
+        .UpdateDisplay(resolution);
   }
 
   const Browser* OpenNewBrowserWindow() {