aura: Remove event-dispatch methods from WindowTreeHostDelegate interface.

ui/keyboard/keyboard_util.cc

Index: ui/keyboard/keyboard_util.cc
diff --git a/ui/keyboard/keyboard_util.cc b/ui/keyboard/keyboard_util.cc
index f31407a7ba4de732213a5fa4be278d84a941098d..9779e9b070162ec4ce925b1b50b925d337ffd055 100644
--- a/ui/keyboard/keyboard_util.cc
+++ b/ui/keyboard/keyboard_util.cc
@@ -29,7 +29,8 @@ void SendProcessKeyEvent(ui::EventType type,
   ui::TranslatedKeyEvent event(type == ui::ET_KEY_PRESSED,
                                ui::VKEY_PROCESSKEY,
                                ui::EF_NONE);
-  dispatcher->AsWindowTreeHostDelegate()->OnHostKeyEvent(&event);
+  ui::EventDispatchDetails details = dispatcher->OnEventFromSource(&event);
+  CHECK(!details.dispatcher_destroyed);
 }
 
 base::LazyInstance<base::Time> g_keyboard_load_time_start =
@@ -99,17 +100,23 @@ bool MoveCursor(int swipe_direction,
   // First deal with the x movement.
   if (codex != ui::VKEY_UNKNOWN) {
     ui::KeyEvent press_event(ui::ET_KEY_PRESSED, codex, modifier_flags, 0);
-    dispatcher->AsWindowTreeHostDelegate()->OnHostKeyEvent(&press_event);
+    ui::EventDispatchDetails details =
+        dispatcher->OnEventFromSource(&press_event);
+    CHECK(!details.dispatcher_destroyed);
     ui::KeyEvent release_event(ui::ET_KEY_RELEASED, codex, modifier_flags, 0);
-    dispatcher->AsWindowTreeHostDelegate()->OnHostKeyEvent(&release_event);
+    details = dispatcher->OnEventFromSource(&release_event);
+    CHECK(!details.dispatcher_destroyed);
   }
 
   // Then deal with the y movement.
   if (codey != ui::VKEY_UNKNOWN) {
     ui::KeyEvent press_event(ui::ET_KEY_PRESSED, codey, modifier_flags, 0);
-    dispatcher->AsWindowTreeHostDelegate()->OnHostKeyEvent(&press_event);
+    ui::EventDispatchDetails details =
+        dispatcher->OnEventFromSource(&press_event);
+    CHECK(!details.dispatcher_destroyed);
     ui::KeyEvent release_event(ui::ET_KEY_RELEASED, codey, modifier_flags, 0);
-    dispatcher->AsWindowTreeHostDelegate()->OnHostKeyEvent(&release_event);
+    details = dispatcher->OnEventFromSource(&release_event);
+    CHECK(!details.dispatcher_destroyed);
   }
   return true;
 }
@@ -162,7 +169,8 @@ bool SendKeyEvent(const std::string type,
     }
 
     ui::KeyEvent event(event_type, code, key_name, modifiers, false);
-    dispatcher->AsWindowTreeHostDelegate()->OnHostKeyEvent(&event);
+    ui::EventDispatchDetails details = dispatcher->OnEventFromSource(&event);
+    CHECK(!details.dispatcher_destroyed);
   }
   return true;
 }