GTK: fix tabstrip index misalignment during tab removal....

chrome/browser/gtk/tabs/tab_strip_gtk.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 #define CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 
 #include <gtk/gtk.h>
 #include <vector>
 
@@ skipping 253 matching lines @@
 
   // Initializes the new tab button.
   CustomDrawButton* MakeNewTabButton();
 
   // Gets the number of Tabs in the collection.
   int GetTabCount() const;
 
   // Returns the number of pinned tabs.
   int GetPinnedTabCount() const;
 
-  // Retrieves the Tab at the specified index.
+  // Retrieves the Tab at the specified index. Take care in using this, you may
+  // need to use GetTabAtAdjustForAnimation.
   TabGtk* GetTabAt(int index) const;
 
+  // Returns the tab at the specified index. If a remove animation is on going
+  // and the index is >= the index of the tab being removed, the index is
+  // incremented. While a remove operation is on going the indices of the model
+  // do not line up with the indices of the view. This method adjusts the index
+  // accordingly.
+  //
+  // Use this instead of GetTabAt if the index comes from the model.
+  TabGtk* GetTabAtAdjustForAnimation(int index) const;
+
   // Returns the exact (unrounded) current width of each tab.
   void GetCurrentTabWidths(double* unselected_width,
                            double* selected_width) const;
 
   // Returns the exact (unrounded) desired width of each tab, based on the
   // desired strip width and number of tabs.  If
   // |width_of_tabs_for_mouse_close_| is nonnegative we use that value in
   // calculating the desired strip width; otherwise we use the current width.
   // |pinned_tab_count| gives the number of pinned tabs, and |tab_count| the
   // number of pinned and non-pinned tabs.
@@ skipping 149 matching lines @@
   // ResizeLayoutTabsNow method.
   ScopedRunnableMethodFactory<TabStripGtk> resize_layout_factory_;
 
   // True if the tabstrip has already been added as a MessageLoop observer.
   bool added_as_message_loop_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStripGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_