Fix showing the sibling menu on mouse move

ash/drag_drop/drag_drop_controller_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/drag_drop/drag_drop_controller.h"
 
 #include "ash/common/drag_drop/drag_image_view.h"
 #include "ash/drag_drop/drag_drop_tracker.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
@@ skipping 765 matching lines @@
     generator.MoveMouseBy(0, 1);
 
     // Execute any scheduled draws to process deferred mouse events.
     RunAllPendingInMessageLoop();
   }
   // Make sure the capture window won't handle mouse events.
   aura::Window* capture_window = drag_drop_tracker()->capture_window();
   ASSERT_TRUE(capture_window);
   EXPECT_EQ("0x0", capture_window->bounds().size().ToString());
   EXPECT_EQ(NULL, capture_window->GetEventHandlerForPoint(gfx::Point()));
-  EXPECT_EQ(NULL, capture_window->GetTopWindowContainingPoint(gfx::Point()));
 
   aura::client::GetCaptureClient(widget->GetNativeView()->GetRootWindow())
       ->SetCapture(NULL);
 
   EXPECT_TRUE(drag_drop_controller_->drag_start_received_);
   EXPECT_EQ(num_drags - 1 - drag_view->VerticalDragThreshold(),
             drag_drop_controller_->num_drag_updates_);
   EXPECT_FALSE(drag_drop_controller_->drop_received_);
   EXPECT_TRUE(drag_drop_controller_->drag_canceled_);
   EXPECT_EQ(base::UTF8ToUTF16("I am being dragged"),
@@ skipping 303 matching lines @@
             drag_drop_controller_->drag_string_);
   EXPECT_EQ(1, drag_view->num_drag_enters_);
   EXPECT_EQ(2, drag_view->num_drag_updates_);
   EXPECT_EQ(1, drag_view->num_drops_);
   EXPECT_EQ(0, drag_view->num_drag_exits_);
   EXPECT_TRUE(drag_view->drag_done_received_);
 }
 
 }  // namespace test
 }  // namespace ash