[Mac] Break stale controller refs in infobar close.

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

Index: chrome/browser/ui/cocoa/translate/before_translate_infobar_controller.mm
diff --git a/chrome/browser/ui/cocoa/translate/before_translate_infobar_controller.mm b/chrome/browser/ui/cocoa/translate/before_translate_infobar_controller.mm
index 121d1c602a615c8b379c44d7141600d712065d38..388e6aff30685f56017332631f4afcc853a6ceec 100644
--- a/chrome/browser/ui/cocoa/translate/before_translate_infobar_controller.mm
+++ b/chrome/browser/ui/cocoa/translate/before_translate_infobar_controller.mm
@@ -30,6 +30,12 @@ NSButton* CreateNSButtonWithResourceIDAndParameter(
 
 @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])) {
@@ -100,12 +106,16 @@ NSButton* CreateNSButtonWithResourceIDAndParameter(
 
 // 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 {