Revert part of r82614 which regressed dropping stuff onto the tabstrip

chrome/browser/ui/gtk/tabs/tab_strip_gtk.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/gtk/tabs/tab_strip_gtk.h"
 
 #include <algorithm>
 
 #include "base/i18n/rtl.h"
 #include "base/string_util.h"
@@ skipping 1965 matching lines @@
     gtk_drag_finish(context, FALSE, FALSE, time);
   else
     gtk_drag_get_data(widget, context, target, time);
 
   return TRUE;
 }
 
 gboolean TabStripGtk::OnDragLeave(GtkWidget* widget, GdkDragContext* context,
                                   guint time) {
   // Destroy the drop indicator.
-  drop_info_.reset();
+  drop_info_->DestroyContainer();
 
   // Cancel any pending tab transition.
   hover_tab_selector_.CancelTabTransition();
 
   return FALSE;
 }
 
 gboolean TabStripGtk::OnDragDataReceived(GtkWidget* widget,
                                          GdkDragContext* context,
                                          gint x, gint y,
@@ skipping 79 matching lines @@
 
   // Let the middle mouse button initiate clicks as well.
   gtk_util::SetButtonTriggersNavigation(button->widget());
   g_signal_connect(button->widget(), "clicked",
                    G_CALLBACK(OnNewTabClickedThunk), this);
   GTK_WIDGET_UNSET_FLAGS(button->widget(), GTK_CAN_FOCUS);
   gtk_fixed_put(GTK_FIXED(tabstrip_.get()), button->widget(), 0, 0);
 
   return button;
 }