events: Update key-event handlers to not return EventResult.

ash/wm/toplevel_window_event_handler.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/toplevel_window_event_handler.h"
 
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/resize_shadow_controller.h"
 #include "ash/wm/window_resizer.h"
@@ skipping 105 matching lines @@
   owner->AddPreTargetHandler(this);
   owner->AddPostTargetHandler(this);
 }
 
 ToplevelWindowEventHandler::~ToplevelWindowEventHandler() {
   Shell::GetInstance()->display_controller()->RemoveObserver(this);
   if (destroyed_)
     *destroyed_ = true;
 }
 
-ui::EventResult ToplevelWindowEventHandler::OnKeyEvent(ui::KeyEvent* event) {
+void ToplevelWindowEventHandler::OnKeyEvent(ui::KeyEvent* event) {
   if (window_resizer_.get() && event->type() == ui::ET_KEY_PRESSED &&
       event->key_code() == ui::VKEY_ESCAPE) {
     CompleteDrag(DRAG_REVERT, event->flags());
   }
-  return ui::ER_UNHANDLED;
 }
 
 ui::EventResult ToplevelWindowEventHandler::OnMouseEvent(
     ui::MouseEvent* event) {
   if ((event->flags() &
       (ui::EF_MIDDLE_MOUSE_BUTTON | ui::EF_RIGHT_MOUSE_BUTTON)) != 0)
     return ui::ER_UNHANDLED;
 
   aura::Window* target = static_cast<aura::Window*>(event->target());
   switch (event->type()) {
@@ skipping 294 matching lines @@
 void ToplevelWindowEventHandler::ResizerWindowDestroyed() {
   // We explicitly don't invoke RevertDrag() since that may do things to window.
   // Instead we destroy the resizer.
   window_resizer_.reset();
 
   // End the move loop. This does nothing if we're not in a move loop.
   EndMoveLoop();
 }
 
 }  // namespace ash