events: Update mouse-event handlers to not return EventResult.

ash/extended_desktop_unittest.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 "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/tray/system_tray.h"
@@ skipping 72 matching lines @@
 // An event filter which moves the target window to the secondary root window
 // at pre-handle phase of a mouse release event.
 class MoveWindowByClickEventFilter : public ui::EventHandler {
  public:
   explicit MoveWindowByClickEventFilter(aura::Window* target)
       : target_(target) {}
   virtual ~MoveWindowByClickEventFilter() {}
 
  private:
   // ui::EventHandler overrides:
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
     if (event->type() == ui::ET_MOUSE_RELEASED) {
       Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
       DCHECK_LT(1u, root_windows.size());
       root_windows[1]->AddChild(target_);
     }
-    return ui::ER_UNHANDLED;
   }
 
   aura::Window* target_;
   DISALLOW_COPY_AND_ASSIGN(MoveWindowByClickEventFilter);
 };
 
 }  // namespace
 
 typedef test::AshTestBase ExtendedDesktopTest;
 
@@ skipping 579 matching lines @@
 
   aura::test::EventGenerator generator22(root_windows[1]);
   generator22.PressKey(ui::VKEY_E, 0);
   generator22.ReleaseKey(ui::VKEY_E, 0);
   EXPECT_EQ(lock_widget->GetNativeView(), focus_client->GetFocusedWindow());
   EXPECT_EQ("abcde", UTF16ToASCII(textfield->text()));
 }
 
 }  // namespace internal
 }  // namespace ash