Fix compile error on XCode4 / clang.

chrome/browser/ui/cocoa/infobars/translate_infobar_base.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.
 
 #import "chrome/browser/ui/cocoa/infobars/translate_infobar_base.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 482 matching lines @@
     [optionsPopUp_ setFrame:oldFrame];
     [[optionsPopUp_ cell] setArrowPosition:NSPopUpArrowAtCenter];
     MoveControl(closeButton_, optionsPopUp_, spaceBetweenControls_, false);
     if (!VerifyControlOrderAndSpacing(lastView, optionsPopUp_)) {
       [optionsPopUp_ setHidden:YES];
     }
   }
 }
 
 // Called when "Translate" button is clicked.
-- (IBAction)ok:(id)sender {
+- (void)ok:(id)sender {
   if (![self isOwned])
     return;
   TranslateInfoBarDelegate* delegate = [self delegate];
   TranslateInfoBarDelegate::Type state = delegate->type();
   DCHECK(state == TranslateInfoBarDelegate::BEFORE_TRANSLATE ||
          state == TranslateInfoBarDelegate::TRANSLATION_ERROR);
   delegate->Translate();
   UMA_HISTOGRAM_COUNTS("Translate.Translate", 1);
 }
 
 // Called when someone clicks on the "Nope" button.
-- (IBAction)cancel:(id)sender {
+- (void)cancel:(id)sender {
   if (![self isOwned])
     return;
   TranslateInfoBarDelegate* delegate = [self delegate];
   DCHECK(delegate->type() == TranslateInfoBarDelegate::BEFORE_TRANSLATE);
   delegate->TranslationDeclined();
   UMA_HISTOGRAM_COUNTS("Translate.DeclineTranslate", 1);
   [super removeSelf];
 }
 
 - (void)messageButtonPressed:(id)sender {
@@ skipping 125 matching lines @@
           [[control description] UTF8String] <<[title UTF8String];
       return false;
     }
     previousControl = control;
   }
 
   return true;
 }
 
 @end // TranslateInfoBarControllerBase (TestingAPI)