Don't show hidden devices in UI (exept from imageburner).

chrome/browser/extensions/extension_file_browser_private_api.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_file_browser_private_api.h"
 
 #include "base/base64.h"
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
@@ skipping 1444 matching lines @@
   if (!args_->GetString(0, &volume_device_path)) {
     NOTREACHED();
   }
 
 #ifdef OS_CHROMEOS
   chromeos::MountLibrary* mount_lib =
       chromeos::CrosLibrary::Get()->GetMountLibrary();
   chromeos::MountLibrary::DiskMap::const_iterator volume_it =
       mount_lib->disks().find(volume_device_path);
 
-  if (volume_it != mount_lib->disks().end()) {
+  if (volume_it != mount_lib->disks().end() &&
+      !volume_it->second->is_hidden()) {
     chromeos::MountLibrary::Disk* volume = volume_it->second;
     DictionaryValue* volume_info = new DictionaryValue();
     result_.reset(volume_info);
     // Localising mount path.
     std::string mount_path;
     if (!volume->mount_path().empty()) {
       FilePath relative_mount_path;
       FileManagerUtil::ConvertFileToRelativeFileSystemPath(profile_,
           FilePath(volume->mount_path()), &relative_mount_path);
       mount_path = relative_mount_path.value();
@@ skipping 179 matching lines @@
       l10n_util::GetStringUTF16(IDS_CERT_MANAGER_VIEW_CERT_BUTTON));
   dict->SetString("PLAY_MEDIA",
       l10n_util::GetStringUTF16(IDS_CONTENT_CONTEXT_PLAY));
 #if defined(OS_CHROMEOS)
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableArchives))
     dict->SetString("ENABLE_ARCHIVES", "true");
 #endif
 
   return true;
 }