Fix compile error on XCode4 / clang.

chrome/browser/ui/cocoa/infobars/translate_infobar_base.mm

Index: chrome/browser/ui/cocoa/infobars/translate_infobar_base.mm
diff --git a/chrome/browser/ui/cocoa/infobars/translate_infobar_base.mm b/chrome/browser/ui/cocoa/infobars/translate_infobar_base.mm
index 584c68ebed21248b27a5e2373c525ea03759e117..cef8922a99346c86f774063d5656190433dc4343 100644
--- a/chrome/browser/ui/cocoa/infobars/translate_infobar_base.mm
+++ b/chrome/browser/ui/cocoa/infobars/translate_infobar_base.mm
@@ -500,7 +500,7 @@ InfoBar* TranslateInfoBarDelegate::CreateInfoBar(InfoBarTabHelper* owner) {
 }
 
 // Called when "Translate" button is clicked.
-- (IBAction)ok:(id)sender {
+- (void)ok:(id)sender {
   if (![self isOwned])
     return;
   TranslateInfoBarDelegate* delegate = [self delegate];
@@ -512,7 +512,7 @@ InfoBar* TranslateInfoBarDelegate::CreateInfoBar(InfoBarTabHelper* owner) {
 }
 
 // Called when someone clicks on the "Nope" button.
-- (IBAction)cancel:(id)sender {
+- (void)cancel:(id)sender {
   if (![self isOwned])
     return;
   TranslateInfoBarDelegate* delegate = [self delegate];