events: Change gesture-event handler in EventHandler to not return any values.

ash/wm/workspace/workspace_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/workspace/workspace_event_handler.h"
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/window_util.h"
@@ skipping 88 matching lines @@
       multi_window_resize_controller_.Hide();
       HandleVerticalResizeDoubleClick(target, event);
       break;
     }
     default:
       break;
   }
   return ToplevelWindowEventHandler::OnMouseEvent(event);
 }
 
-ui::EventResult WorkspaceEventHandler::OnGestureEvent(ui::GestureEvent* event) {
+void WorkspaceEventHandler::OnGestureEvent(ui::GestureEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
   if (event->type() == ui::ET_GESTURE_DOUBLE_TAP &&
       target->delegate()->GetNonClientComponent(event->location()) ==
       HTCAPTION) {
     ToggleMaximizedState(target);  // |this| may be destroyed from here.
-    return ui::ER_CONSUMED;
+    event->StopPropagation();
+    return;
   }
-  return ToplevelWindowEventHandler::OnGestureEvent(event);
+  ToplevelWindowEventHandler::OnGestureEvent(event);
 }
 
 void WorkspaceEventHandler::HandleVerticalResizeDoubleClick(
     aura::Window* target,
     ui::MouseEvent* event) {
   gfx::Rect max_size(target->delegate()->GetMaximumSize());
   if (event->flags() & ui::EF_IS_DOUBLE_CLICK &&
       !wm::IsWindowMaximized(target)) {
     int component =
         target->delegate()->GetNonClientComponent(event->location());
@@ skipping 30 matching lines @@
                                      target->bounds().y(),
                                      work_area.width(),
                                      target->bounds().height()));
       }
     }
   }
 }
 
 }  // namespace internal
 }  // namespace ash