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

ui/views/widget/root_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_WIDGET_ROOT_VIEW_H_
 #define UI_VIEWS_WIDGET_ROOT_VIEW_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 46 matching lines @@
                                         gfx::NativeView native_view);
 
   // Input ---------------------------------------------------------------------
 
   // Process a key event. Send the event to the focused view and up the focus
   // path, and finally to the default keyboard handler, until someone consumes
   // it. Returns whether anyone consumed the event.
   ui::EventResult DispatchKeyEvent(const ui::KeyEvent& event);
   ui::EventResult DispatchScrollEvent(ui::ScrollEvent* event);
   ui::EventResult DispatchTouchEvent(ui::TouchEvent* event);
-  virtual ui::EventResult DispatchGestureEvent(ui::GestureEvent* event);
+  virtual void DispatchGestureEvent(ui::GestureEvent* event);
 
   // Focus ---------------------------------------------------------------------
 
   // Used to set the FocusTraversable parent after the view has been created
   // (typically when the hierarchy changes and this RootView is added/removed).
   virtual void SetFocusTraversableParent(FocusTraversable* focus_traversable);
 
   // Used to set the View parent after the view has been created.
   virtual void SetFocusTraversableParentView(View* view);
 
@@ skipping 114 matching lines @@
   // Tracks drag state for a view.
   View::DragInfo drag_info_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(RootView);
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_ROOT_VIEW_H_