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

ui/views/controls/button/menu_button.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 "ui/views/controls/button/menu_button.h"
 
 #include "base/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "grit/ui_strings.h"
 #include "ui/base/accessibility/accessible_view_state.h"
@@ skipping 201 matching lines @@
 // we display the menu. If we don't override this method then
 // BaseButton::OnMouseExited will get the event and will set the button's state
 // to STATE_NORMAL instead of keeping the state BM_PUSHED. This, in turn, will
 // cause the button to appear depressed while the menu is displayed.
 void MenuButton::OnMouseExited(const ui::MouseEvent& event) {
   if ((state_ != STATE_DISABLED) && (!menu_visible_) && (!InDrag())) {
     SetState(STATE_NORMAL);
   }
 }
 
-ui::EventResult MenuButton::OnGestureEvent(ui::GestureEvent* event) {
+void MenuButton::OnGestureEvent(ui::GestureEvent* event) {
   if (state() != STATE_DISABLED && event->type() == ui::ET_GESTURE_TAP) {
     if (Activate())
-      return ui::ER_CONSUMED;
-    return ui::ER_UNHANDLED;
+      event->StopPropagation();
+    return;
   }
-  return TextButton::OnGestureEvent(event);
+  TextButton::OnGestureEvent(event);
 }
 
 bool MenuButton::OnKeyPressed(const ui::KeyEvent& event) {
   switch (event.key_code()) {
     case ui::VKEY_SPACE:
       // Alt-space on windows should show the window menu.
       if (event.IsAltDown())
         break;
     case ui::VKEY_RETURN:
     case ui::VKEY_UP:
@@ skipping 25 matching lines @@
   if (!GetWidget()) {
     NOTREACHED();
     return 0;
   }
 
   gfx::Rect monitor_bounds = GetWidget()->GetWorkAreaBoundsInScreen();
   return monitor_bounds.right() - 1;
 }
 
 }  // namespace views