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

ui/views/controls/scroll_view.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_SCROLL_VIEW_H_
 #define UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 61 matching lines @@
   // value is used.
   virtual int GetScrollIncrement(ScrollBar* source,
                                  bool is_page,
                                  bool is_positive) OVERRIDE;
 
   // Keyboard events
   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
   virtual bool OnMouseWheel(const ui::MouseWheelEvent& e) OVERRIDE;
 
   // Overridden from ui::EventHandler:
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   virtual std::string GetClassName() const OVERRIDE;
 
   // Retrieves the vertical scrollbar width.
   int GetScrollBarWidth() const;
 
   // Retrieves the horizontal scrollbar height.
   int GetScrollBarHeight() const;
 
   // Computes the visibility of both scrollbars, taking in account the view port
@@ skipping 110 matching lines @@
  private:
   int top_margin_;
   int row_height_;
 
   DISALLOW_COPY_AND_ASSIGN(FixedRowHeightScrollHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLL_VIEW_H_