mac: Don't animate tab close when closing all tabs.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 1495 matching lines @@
 // in motion.
 - (void)tabDetachedWithContents:(content::WebContents*)contents
                         atIndex:(NSInteger)modelIndex {
   // Take closing tabs into account.
   NSInteger index = [self indexFromModelIndex:modelIndex];
 
   // Cancel any pending tab transition.
   hoverTabSelector_->CancelTabTransition();
 
   TabController* tab = [tabArray_ objectAtIndex:index];
-  if (tabStripModel_->count() > 0) {
+  if (tabStripModel_->count() > 0 && !tabStripModel_->closing_all()) {
     [self startClosingTabWithAnimation:tab];
     [self layoutTabs];
   } else {
     // Don't remove the tab, as that makes the window look jarring without any
     // tabs. Instead, simply mark it as closing to prevent the tab from
     // generating any drags or selections.
     [[tab tabView] setClosing:YES];
   }
 
   [delegate_ onTabDetachedWithContents:contents];
@@ skipping 862 matching lines @@
   for (int i = 0; i < tabStripModel_->count(); i++) {
     [self updateIconsForContents:tabStripModel_->GetWebContentsAt(i) atIndex:i];
   }
 }
 
 - (void)setVisualEffectsDisabledForFullscreen:(BOOL)fullscreen {
   [tabStripView_ setVisualEffectsDisabledForFullscreen:fullscreen];
 }
 
 @end