Provide access to the WindowEventDispatcher as a ui::EventProcessor.

ash/extended_desktop_unittest.cc

Index: ash/extended_desktop_unittest.cc
diff --git a/ash/extended_desktop_unittest.cc b/ash/extended_desktop_unittest.cc
index 600cdef9b335bb9e3b2dd0e2b129b9f3d8369e99..dbab0792c767f8af3c5638ada5a5b0ae229d6ad2 100644
--- a/ash/extended_desktop_unittest.cc
+++ b/ash/extended_desktop_unittest.cc
@@ -788,15 +788,13 @@ TEST_F(ExtendedDesktopTest, KeyEventsOnLockScreen) {
   // The lock window should get events on both root windows.
   aura::test::EventGenerator& event_generator(GetEventGenerator());
 
-  event_generator.set_current_dispatcher(
-      root_windows[0]->GetHost()->dispatcher());
+  event_generator.set_current_host(root_windows[0]->GetHost());
   event_generator.PressKey(ui::VKEY_A, 0);
   event_generator.ReleaseKey(ui::VKEY_A, 0);
   EXPECT_EQ(lock_widget->GetNativeView(), focus_client->GetFocusedWindow());
   EXPECT_EQ("a", UTF16ToASCII(textfield->text()));
 
-  event_generator.set_current_dispatcher(
-      root_windows[1]->GetHost()->dispatcher());
+  event_generator.set_current_host(root_windows[1]->GetHost());
   event_generator.PressKey(ui::VKEY_B, 0);
   event_generator.ReleaseKey(ui::VKEY_B, 0);
   EXPECT_EQ(lock_widget->GetNativeView(), focus_client->GetFocusedWindow());
@@ -813,15 +811,13 @@ TEST_F(ExtendedDesktopTest, KeyEventsOnLockScreen) {
   // on both root windows.
   UpdateDisplay("100x100,200x200");
   root_windows = Shell::GetAllRootWindows();
-  event_generator.set_current_dispatcher(
-      root_windows[0]->GetHost()->dispatcher());
+  event_generator.set_current_host(root_windows[0]->GetHost());
   event_generator.PressKey(ui::VKEY_D, 0);
   event_generator.ReleaseKey(ui::VKEY_D, 0);
   EXPECT_EQ(lock_widget->GetNativeView(), focus_client->GetFocusedWindow());
   EXPECT_EQ("abcd", UTF16ToASCII(textfield->text()));
 
-  event_generator.set_current_dispatcher(
-      root_windows[1]->GetHost()->dispatcher());
+  event_generator.set_current_host(root_windows[1]->GetHost());
   event_generator.PressKey(ui::VKEY_E, 0);
   event_generator.ReleaseKey(ui::VKEY_E, 0);
   EXPECT_EQ(lock_widget->GetNativeView(), focus_client->GetFocusedWindow());