aura: Remove event-dispatch methods from WindowTreeHostDelegate interface.

ash/wm/workspace/workspace_event_handler_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/workspace/workspace_event_handler.h"
 
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_state.h"
@@ skipping 287 matching lines @@
   EXPECT_FALSE(window_state->IsMaximized());
   EXPECT_EQ("1,2 30x40", window->bounds().ToString());
 
   // Double-clicking the middle button shouldn't toggle the maximized state.
   WindowPropertyObserver observer(window.get());
   ui::MouseEvent press(ui::ET_MOUSE_PRESSED, generator.current_location(),
                        generator.current_location(),
                        ui::EF_MIDDLE_MOUSE_BUTTON | ui::EF_IS_DOUBLE_CLICK,
                        ui::EF_MIDDLE_MOUSE_BUTTON);
   aura::WindowEventDispatcher* dispatcher = root->GetDispatcher();
-  dispatcher->AsWindowTreeHostDelegate()->OnHostMouseEvent(&press);
+  ui::EventDispatchDetails details = dispatcher->OnEventFromSource(&press);
+  ASSERT_FALSE(details.dispatcher_destroyed);
   ui::MouseEvent release(ui::ET_MOUSE_RELEASED, generator.current_location(),
                          generator.current_location(),
                          ui::EF_IS_DOUBLE_CLICK,
                          ui::EF_MIDDLE_MOUSE_BUTTON);
-  dispatcher->AsWindowTreeHostDelegate()->OnHostMouseEvent(&release);
+  details = dispatcher->OnEventFromSource(&release);
+  ASSERT_FALSE(details.dispatcher_destroyed);
 
   EXPECT_FALSE(window_state->IsMaximized());
   EXPECT_EQ("1,2 30x40", window->bounds().ToString());
   EXPECT_FALSE(observer.DidPropertyChange(aura::client::kShowStateKey));
 }
 
 TEST_F(WorkspaceEventHandlerTest, DoubleTapCaptionTogglesMaximize) {
   aura::test::TestWindowDelegate wd;
   gfx::Rect bounds(10, 20, 30, 40);
   scoped_ptr<aura::Window> window(CreateTestWindow(&wd, bounds));
@@ skipping 48 matching lines @@
   ASSERT_TRUE(aura::client::GetWindowMoveClient(window->GetRootWindow()));
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, window.get());
   aura::client::GetWindowMoveClient(window->GetRootWindow())
       ->RunMoveLoop(window.release(),
                     gfx::Vector2d(),
                     aura::client::WINDOW_MOVE_SOURCE_MOUSE);
 }
 
 }  // namespace internal
 }  // namespace ash