More accelerator code leanup

ash/accelerators/accelerator_filter_unittest.cc

Index: ash/accelerators/accelerator_filter_unittest.cc
diff --git a/ash/accelerators/accelerator_filter_unittest.cc b/ash/accelerators/accelerator_filter_unittest.cc
index 0359680889b002a1321726f5ad17eabc5bc58731..69db83100aff1f3179943de4e166bec2537ff723 100644
--- a/ash/accelerators/accelerator_filter_unittest.cc
+++ b/ash/accelerators/accelerator_filter_unittest.cc
@@ -89,15 +89,24 @@ TEST_F(AcceleratorFilterTest, TestCapsLockMask) {
 TEST_F(AcceleratorFilterTest, CanConsumeSystemKeys) {
   ::wm::AcceleratorFilter filter(
       scoped_ptr< ::wm::AcceleratorDelegate>(new AcceleratorDelegate).Pass());
+  aura::Window* root_window = Shell::GetPrimaryRootWindow();
 
   // Normal keys are not consumed.
   ui::KeyEvent press_a(ui::ET_KEY_PRESSED, ui::VKEY_A, ui::EF_NONE, false);
+  {
+    ui::Event::DispatcherApi dispatch_helper(&press_a);
+    dispatch_helper.set_target(root_window);
+  }
   filter.OnKeyEvent(&press_a);
   EXPECT_FALSE(press_a.stopped_propagation());
 
   // System keys are directly consumed.
   ui::KeyEvent press_mute(
       ui::ET_KEY_PRESSED, ui::VKEY_VOLUME_MUTE, ui::EF_NONE, false);
+  {
+    ui::Event::DispatcherApi dispatch_helper(&press_mute);
+    dispatch_helper.set_target(root_window);
+  }
   filter.OnKeyEvent(&press_mute);
   EXPECT_TRUE(press_mute.stopped_propagation());