Moves management of transients out of Window

ash/test/ash_test_helper.cc

Index: ash/test/ash_test_helper.cc
diff --git a/ash/test/ash_test_helper.cc b/ash/test/ash_test_helper.cc
index 6cff6baf4df6726b0cc66256999753c27850bf95..f362f6773709df06198c0c03d0007ab8d4bc5cf1 100644
--- a/ash/test/ash_test_helper.cc
+++ b/ash/test/ash_test_helper.cc
@@ -49,6 +49,10 @@ AshTestHelper::~AshTestHelper() {
 }
 
 void AshTestHelper::SetUp(bool start_session) {
+  // SetWindowStackingClient() takes ownership of TransientWindowStackingClient.
+  aura::client::SetWindowStackingClient(
+      new views::corewm::TransientWindowStackingClient);
+
   // Disable animations during tests.
   zero_duration_mode_.reset(new ui::ScopedAnimationDurationScaleMode(
       ui::ScopedAnimationDurationScaleMode::ZERO_DURATION));
@@ -88,10 +92,6 @@ void AshTestHelper::SetUp(bool start_session) {
   test_screenshot_delegate_ = new TestScreenshotDelegate();
   shell->accelerator_controller()->SetScreenshotDelegate(
       scoped_ptr<ScreenshotDelegate>(test_screenshot_delegate_));
-
-  // SetWindowStackingClient() takes ownership of TransientWindowStackingClient.
-  aura::client::SetWindowStackingClient(
-      new views::corewm::TransientWindowStackingClient);
 }
 
 void AshTestHelper::TearDown() {