Fix crash when quickly dragging a new tab.

chrome/browser/ui/gtk/tabs/tab_strip_gtk.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 "chrome/browser/ui/gtk/tabs/tab_strip_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 1388 matching lines @@
   }
   return GetTabAt(index);
 }
 
 void TabStripGtk::RemoveTabAt(int index) {
   TabGtk* removed = tab_data_.at(index).tab;
 
   // Remove the Tab from the TabStrip's list.
   tab_data_.erase(tab_data_.begin() + index);
 
-  if (!IsDragSessionActive() || !drag_controller_->IsDraggingTab(removed)) {
+  if (!removed->dragging()) {
     gtk_container_remove(GTK_CONTAINER(tabstrip_.get()), removed->widget());
     delete removed;
   }
 }
 
 void TabStripGtk::HandleGlobalMouseMoveEvent() {
   if (!IsCursorInTabStripZone()) {
     // Mouse moved outside the tab slop zone, start a timer to do a resize
     // layout after a short while...
     if (!weak_factory_.HasWeakPtrs()) {
@@ skipping 852 matching lines @@
 
 void TabStripGtk::SetNewTabButtonBackground() {
   SkColor color = theme_service_->GetColor(
       ThemeProperties::COLOR_BUTTON_BACKGROUND);
   SkBitmap background = theme_service_->GetImageNamed(
       IDR_THEME_WINDOW_CONTROL_BACKGROUND).AsBitmap();
   SkBitmap mask = theme_service_->GetImageNamed(
       IDR_NEWTAB_BUTTON_MASK).AsBitmap();
   newtab_button_->SetBackground(color, background, mask);
 }