events: Start changing EventHandler interface to not return a value.

ui/aura/root_window.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_AURA_ROOT_WINDOW_H_
 #define UI_AURA_ROOT_WINDOW_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 262 matching lines @@
   // factor. The RootWindowHostDelegate dispatches events in the physical pixel
   // coordinate. But the event processing from RootWindow onwards happen in
   // device-independent pixel coordinate. So it is necessary to update the event
   // received from the host.
   void TransformEventForDeviceScaleFactor(ui::LocatedEvent* event);
 
   // Called whenever the mouse moves, tracks the current |mouse_moved_handler_|,
   // sending exited and entered events as its value changes.
   void HandleMouseMoved(const ui::MouseEvent& event, Window* target);
 
-  bool ProcessMouseEvent(Window* target, ui::MouseEvent* event);
-  bool ProcessKeyEvent(Window* target, ui::KeyEvent* event);
-  bool ProcessScrollEvent(Window* target, ui::ScrollEvent* event);
-  ui::EventResult ProcessTouchEvent(Window* target, ui::TouchEvent* event);
-  ui::EventResult ProcessGestureEvent(Window* target,
+  void ProcessMouseEvent(Window* target, ui::MouseEvent* event);
+  void ProcessKeyEvent(Window* target, ui::KeyEvent* event);
+  void ProcessScrollEvent(Window* target, ui::ScrollEvent* event);
+  void ProcessTouchEvent(Window* target, ui::TouchEvent* event);
+  void ProcessGestureEvent(Window* target,
                                       ui::GestureEvent* event);
   bool ProcessGestures(ui::GestureRecognizer::Gestures* gestures);
 
   // Called when a Window is attached or detached from the RootWindow.
   void OnWindowAddedToRootWindow(Window* window);
   void OnWindowRemovedFromRootWindow(Window* window, RootWindow* new_root);
 
   // Called when a window becomes invisible, either by being removed
   // from root window hierachy, via SetVisible(false) or being destroyed.
   // |reason| specifies what triggered the hiding. |new_root| is the new root
@@ skipping 101 matching lines @@
   base::WeakPtrFactory<RootWindow> held_mouse_event_factory_;
 
   scoped_ptr<ui::ViewProp> prop_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_