[Mac] Break stale controller refs in infobar close.

chrome/browser/ui/cocoa/translate/before_translate_infobar_controller.mm

 // Copyright (c) 2011 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/cocoa/translate/before_translate_infobar_controller.h"
 
 #include "base/sys_string_conversions.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ skipping 12 matching lines @@
   NSFont* font = [NSFont systemFontOfSize:
       [NSFont systemFontSizeForControlSize:NSRegularControlSize]];
   [[button cell] setFont:font];
   return button;
 }
 
 } // namespace
 
 @implementation BeforeTranslateInfobarController
 
+- (void)dealloc {
+  [neverTranslateButton_ setTarget:nil];
+  [alwaysTranslateButton_ setTarget:nil];
+  [super dealloc];
+}
+
 - (id) initWithDelegate:(InfoBarDelegate *)delegate
                   owner:(TabContentsWrapper*)owner {
   if ((self = [super initWithDelegate:delegate owner:owner])) {
     [self initializeExtraControls];
   }
   return self;
 }
 
 - (void)initializeExtraControls {
   TranslateInfoBarDelegate* delegate = [self delegate];
@@ skipping 50 matching lines @@
     [visibleControls addObject:neverTranslateButton_.get()];
 
   if ([self delegate]->ShouldShowAlwaysTranslateButton())
     [visibleControls addObject:alwaysTranslateButton_.get()];
 
   return visibleControls;
 }
 
 // This is called when the "Never Translate [language]" button is pressed.
 - (void)neverTranslate:(id)sender {
-  [self delegate]->NeverTranslatePageLanguage();
+  TranslateInfoBarDelegate* delegate = [self delegate];
+  if (delegate)
+    [self delegate]->NeverTranslatePageLanguage();

[Nico, 2011/09/13 06:25:38]

Nit: s/[self delegate]/delegate/

 }
 
 // This is called when the "Always Translate [language]" button is pressed.
 - (void)alwaysTranslate:(id)sender {
-  [self delegate]->AlwaysTranslatePageLanguage();
+  TranslateInfoBarDelegate* delegate = [self delegate];
+  if (delegate)
+    delegate->AlwaysTranslatePageLanguage();
 }
 
 - (bool)verifyLayout {
   if ([optionsPopUp_ isHidden])
     return false;
   return [super verifyLayout];
 }
 
 @end
 
 @implementation BeforeTranslateInfobarController (TestingAPI)
 
 - (NSButton*)alwaysTranslateButton {
   return alwaysTranslateButton_.get();
 }
 - (NSButton*)neverTranslateButton {
   return neverTranslateButton_.get();
 }
 
 @end