Remove unused BackgroundAnimationType to simplify translate delegate.

chrome/browser/ui/cocoa/infobars/translate_infobar_unittest.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 <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include <utility>
 
 #import "base/mac/scoped_nsobject.h"
@@ skipping 32 matching lines @@
     : public translate::TranslateInfoBarDelegate {
  public:
   MockTranslateInfoBarDelegate(content::WebContents* web_contents,
                                translate::TranslateStep step,
                                translate::TranslateErrors::Type error)
       : translate::TranslateInfoBarDelegate(
             ChromeTranslateClient::GetManagerFromWebContents(web_contents)
                 ->GetWeakPtr(),
             false,
             step,
-            NULL,
             "en",
             "es",
             error,
             false) {}
 
   MOCK_METHOD0(Translate, void());
   MOCK_METHOD0(RevertTranslation, void());
 
   MOCK_METHOD0(TranslationDeclined, void());
 
@@ skipping 206 matching lines @@
   translate_prefs->ResetTranslationDeniedCount("en");
   for (int i = 0; i < 4; ++i) {
     translate_prefs->IncrementTranslationDeniedCount("en");
   }
   CreateInfoBar(translate::TRANSLATE_STEP_BEFORE_TRANSLATE);
   BeforeTranslateInfobarController* controller =
       (BeforeTranslateInfobarController*)infobar_controller_.get();
   EXPECT_TRUE([[controller alwaysTranslateButton] superview] == nil);
   EXPECT_TRUE([[controller neverTranslateButton] superview] != nil);
 }