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

ui/views/controls/tree/tree_view_views.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/tree/tree_view_views.h"
 
 #include <algorithm>
 
 #include "base/i18n/rtl.h"
 #include "base/message_loop.h"
@@ skipping 284 matching lines @@
 }
 
 gfx::Size TreeView::GetPreferredSize() {
   return preferred_size_;
 }
 
 bool TreeView::OnMousePressed(const ui::MouseEvent& event) {
   return OnClickOrTap(event);
 }
 
-ui::EventResult TreeView::OnGestureEvent(ui::GestureEvent* event) {
+void TreeView::OnGestureEvent(ui::GestureEvent* event) {
   if (event->type() == ui::ET_GESTURE_TAP ||
       event->type() == ui::ET_GESTURE_DOUBLE_TAP) {
     if (OnClickOrTap(*event))
-      return ui::ER_CONSUMED;
+      event->SetHandled();
   }
-  return ui::ER_UNHANDLED;
 }
 
 void TreeView::ShowContextMenu(const gfx::Point& p, bool is_mouse_gesture) {
   if (!model_)
     return;
   if (is_mouse_gesture) {
     // Only invoke View's implementation (which notifies the
     // ContextMenuController) if over a node.
     gfx::Point local_point(p);
     ConvertPointToTarget(NULL, this, &local_point);
@@ skipping 592 matching lines @@
   if (!is_expanded_)
     return max_width;
   for (int i = 0; i < child_count(); ++i) {
     max_width = std::max(max_width,
                          GetChild(i)->GetMaxWidth(indent, depth + 1));
   }
   return max_width;
 }
 
 }  // namespace views