Prevent the "Stop using an invalid certificate" button from showing up on about:blank for OSX.

chrome/browser/ui/cocoa/website_settings/website_settings_bubble_controller.mm

 // Copyright 2014 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/website_settings/website_settings_bubble_controller.h"
 
 #include <cmath>
 
 #import <AppKit/AppKit.h>
 
@@ skipping 631 matching lines @@
 
 // Set the content of the identity and identity status fields.
 - (void)setIdentityInfo:(const WebsiteSettingsUI::IdentityInfo&)identityInfo {
   [identityField_
       setStringValue:base::SysUTF8ToNSString(identityInfo.site_identity)];
   [securitySummaryField_ setStringValue:base::SysUTF16ToNSString(
                                             identityInfo.GetSecuritySummary())];
 
   certificateId_ = identityInfo.cert_id;
 
-  if (identityInfo.show_ssl_decision_revoke_button) {
+  if (certificateId_ &&  identityInfo.show_ssl_decision_revoke_button) {
     NSString* text = l10n_util::GetNSString(
         IDS_PAGEINFO_RESET_INVALID_CERTIFICATE_DECISIONS_BUTTON);
     resetDecisionsButton_ =
         [self addButtonWithText:text toView:securitySectionView_];
     [resetDecisionsButton_ setTarget:self];
     [resetDecisionsButton_ setAction:@selector(resetCertificateDecisions:)];
   }
 
   [self performLayout];
 }
@@ skipping 500 matching lines @@
 void WebsiteSettingsUIBridge::SetPermissionInfo(
     const PermissionInfoList& permission_info_list,
     const ChosenObjectInfoList& chosen_object_info_list) {
   [bubble_controller_ setPermissionInfo:permission_info_list
                        andChosenObjects:chosen_object_info_list];
 }
 
 void WebsiteSettingsUIBridge::SetSelectedTab(TabId tab_id) {
   // TODO(lgarron): Remove this from the interface. (crbug.com/571533)
 }