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

ui/views/controls/tree/tree_view_views.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_
 #define UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 90 matching lines @@
   // Sets the controller, which may be null. TreeView does not take ownership
   // of the controller.
   void SetController(TreeViewController* controller) {
     controller_ = controller;
   }
 
   // View overrides:
   virtual void Layout() OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
   virtual void ShowContextMenu(const gfx::Point& p,
                                bool is_mouse_gesture) OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
   // TreeModelObserver overrides:
   virtual void TreeNodesAdded(ui::TreeModel* model,
                               ui::TreeModelNode* parent,
                               int start,
                               int count) OVERRIDE;
   virtual void TreeNodesRemoved(ui::TreeModel* model,
@@ skipping 242 matching lines @@
   // Offset the text is drawn at. This accounts for the size of the expand
   // control, icon and offsets.
   int text_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(TreeView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_