Implement a permission check for push.

chrome/browser/ui/cocoa/content_settings/content_setting_bubble_cocoa.mm

 // Copyright (c) 2012 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/content_settings/content_setting_bubble_cocoa.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 263 matching lines @@
       nibPath = @"ContentBlockedMIDISysEx"; break;
     // These content types have no bubble:
     case CONTENT_SETTINGS_TYPE_DEFAULT:
     case CONTENT_SETTINGS_TYPE_NOTIFICATIONS:
     case CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE:
     case CONTENT_SETTINGS_TYPE_FULLSCREEN:
     case CONTENT_SETTINGS_TYPE_MOUSELOCK:
     case CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC:
     case CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA:
     case CONTENT_SETTINGS_NUM_TYPES:
+    // TODO(miguelg): Remove this when bubble support is implemented
+    case CONTENT_SETTINGS_TYPE_PUSH_MESSAGING:
       NOTREACHED();
   }
   if ((self = [super initWithWindowNibPath:nibPath
                               parentWindow:parentWindow
                                 anchoredAt:anchoredAt])) {
     contentSettingBubbleModel_.reset(model.release());
     [self showWindow:nil];
   }
   return self;
 }
@@ skipping 520 matching lines @@
       button, base::SysUTF16ToNSString(it->second->model->GetLabelAt(index)));
 
   it->second->model->ExecuteCommand(index, 0);
 }
 
 - (content_setting_bubble::MediaMenuPartsMap*)mediaMenus {
   return &mediaMenus_;
 }
 
 @end  // ContentSettingBubbleController