Fix crash in delayed tab resizing. If the Resize Relayout code is called afte...

chrome/browser/views/tabs/tab_strip.cc

 // Copyright (c) 2006-2008 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/views/tabs/tab_strip.h"
 
 #include "app/drag_drop_types.h"
 #include "app/gfx/canvas.h"
 #include "app/gfx/path.h"
 #include "app/l10n_util.h"
@@ skipping 1173 matching lines @@
     } else if ((min_unselected_width > min_selected_width) &&
                (desired_tab_width < min_unselected_width)) {
       // Selected width = (total width - (unselected width * (num_tabs - 1)))
       *selected_width = std::max(available_width - total_offset -
           (min_unselected_width * (tab_count - 1)), min_selected_width);
     }
   }
 }
 
 void TabStrip::ResizeLayoutTabs() {
+  // We've been called back after the TabStrip has been emptied out (probably
+  // just prior to the window being destroyed). We need to do nothing here or
+  // else GetTabAt below will crash.
+  if (GetTabCount() == 0)
+    return;
+
   resize_layout_factory_.RevokeAll();
 
   // It is critically important that this is unhooked here, otherwise we will
   // keep spying on messages forever.
   RemoveMessageLoopObserver();
 
   available_width_for_tabs_ = -1;
   double unselected, selected;
   GetDesiredTabWidths(GetTabCount(), &unselected, &selected);
   Tab* first_tab = GetTabAt(0);
@@ skipping 368 matching lines @@
               &TabStrip::ResizeLayoutTabs),
           kResizeTabsTimeMs);
     }
   } else {
     // Mouse moved quickly out of the tab strip and then into it again, so
     // cancel the timer so that the strip doesn't move when the mouse moves
     // back over it.
     resize_layout_factory_.RevokeAll();
   }
 }