Set DragDropTracker's capture window's size to zero, otherwise, it gets

ash/drag_drop/drag_drop_tracker_unittest.cc

Index: ash/drag_drop/drag_drop_tracker_unittest.cc
diff --git a/ash/drag_drop/drag_drop_tracker_unittest.cc b/ash/drag_drop/drag_drop_tracker_unittest.cc
index 4175c6b1a8a126e0e652dba99bd8a2f368379792..e6e7913c71344884dbfe8dc2cdb91d8d8523f8f6 100644
--- a/ash/drag_drop/drag_drop_tracker_unittest.cc
+++ b/ash/drag_drop/drag_drop_tracker_unittest.cc
@@ -35,7 +35,7 @@ class DragDropTrackerTest : public test::AshTestBase {
   static aura::Window* GetTarget(aura::RootWindow* root_window,

[mazda, 2012/10/01 19:33:24]

Could you delete this |root_window| too?

                           const gfx::Point& location) {
     scoped_ptr<internal::DragDropTracker> tracker(
-        new internal::DragDropTracker(root_window));
+        new internal::DragDropTracker);
     ui::MouseEvent e(ui::ET_MOUSE_DRAGGED,
                      location,
                      location,
@@ -48,7 +48,7 @@ class DragDropTrackerTest : public test::AshTestBase {
                                            aura::Window* target,
                                            const ui::MouseEvent& event) {
     scoped_ptr<internal::DragDropTracker> tracker(
-        new internal::DragDropTracker(root_window));
+        new internal::DragDropTracker);
     ui::MouseEvent* converted = tracker->ConvertMouseEvent(target, event);
     return converted;
   }