Mac: Fix crash when clicking on zombie translate options menu

chrome/browser/ui/cocoa/infobar_controller.mm

 // Copyright (c) 2010 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 <Cocoa/Cocoa.h>
 
 #include "base/logging.h"  // for NOTREACHED()
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/tab_contents/infobar_delegate.h"
@@ skipping 179 matching lines @@
   // The above call may trigger an animationDidStop: notification for any
   // currently-running animations, so do not set |infoBarClosing_| until after
   // starting the animation.
   infoBarClosing_ = YES;
 }
 
 - (void)addAdditionalControls {
   // Default implementation does nothing.
 }
 
+- (void)infobarWillClose {
+  // Default implementation does nothing.
+}
+
 - (void)setLabelToMessage:(NSString*)message {
   NSMutableDictionary* attributes = [NSMutableDictionary dictionary];
   NSFont* font = [NSFont labelFontOfSize:
       [NSFont systemFontSizeForControlSize:NSRegularControlSize]];
   [attributes setObject:font
                  forKey:NSFontAttributeName];
   [attributes setObject:[NSCursor arrowCursor]
                  forKey:NSCursorAttributeName];
   scoped_nsobject<NSAttributedString> attributedString(
       [[NSAttributedString alloc] initWithString:message
@@ skipping 314 matching lines @@
   LinkInfoBarController* controller =
       [[LinkInfoBarController alloc] initWithDelegate:this];
   return new InfoBar(controller);
 }
 
 InfoBar* ConfirmInfoBarDelegate::CreateInfoBar() {
   ConfirmInfoBarController* controller =
       [[ConfirmInfoBarController alloc] initWithDelegate:this];
   return new InfoBar(controller);
 }