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

ash/wm/app_list_controller.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/app_list_controller.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
@@ skipping 213 matching lines @@
 }
 
 void AppListController::UpdateBounds() {
   if (view_ && is_visible_)
     view_->UpdateBounds();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AppListController, aura::EventFilter implementation:
 
-ui::EventResult AppListController::OnMouseEvent(ui::MouseEvent* event) {
+void AppListController::OnMouseEvent(ui::MouseEvent* event) {
   if (event->type() == ui::ET_MOUSE_PRESSED)
     ProcessLocatedEvent(event);
-  return ui::ER_UNHANDLED;
 }
 
 void AppListController::OnGestureEvent(ui::GestureEvent* event) {
   if (event->type() == ui::ET_GESTURE_TAP)
     ProcessLocatedEvent(event);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AppListController,  aura::FocusObserver implementation:
 
@@ skipping 93 matching lines @@
     should_snap_back_ = false;
     ui::ScopedLayerAnimationSettings animation(widget_animator);
     animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
         app_list::kOverscrollPageTransitionDurationMs));
     widget->SetBounds(view_bounds_);
   }
 }
 
 }  // namespace internal
 }  // namespace ash