make media gallery directory tooltips in media gallery config dialog absolute paths

chrome/browser/media_gallery/media_file_system_registry.cc

 // 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.
 
 // MediaFileSystemRegistry implementation.
 
 #include "chrome/browser/media_gallery/media_file_system_registry.h"
 
 #include <set>
 #include <vector>
@@ skipping 275 matching lines @@
         continue;
 
       PrefIdFsInfoMap::const_iterator existing_info =
           pref_id_map_.find(*pref_id_it);
       if (existing_info != pref_id_map_.end()) {
         result.push_back(existing_info->second);
         new_galleries.insert(*pref_id_it);
         continue;
       }
 
-      FilePath path = MediaStorageUtil::FindDevicePathById(device_id);
-      if (path.empty())
+      FilePath path = gallery_info.AbsolutePath();
+      if (!path.IsAbsolute())
         continue;
-      path = path.Append(gallery_info.path);
 
       std::string fsid;
       if (MediaStorageUtil::IsMassStorageDevice(device_id)) {
         fsid = RegisterFileSystemForMassStorage(device_id, path);
       } else {
 #if defined(SUPPORT_MEDIA_FILESYSTEM)
         scoped_refptr<ScopedMediaDeviceMapEntry> mtp_device_host;
         fsid = registry_->RegisterFileSystemForMtpDevice(
             device_id, path, &mtp_device_host);
         DCHECK(mtp_device_host.get());
@@ skipping 320 matching lines @@
       extension_hosts_map_.find(profile);
   DCHECK(extension_hosts != extension_hosts_map_.end());
   ExtensionHostMap::size_type erase_count =
       extension_hosts->second.erase(extension_id);
   DCHECK_EQ(1U, erase_count);
   if (extension_hosts->second.empty())
     extension_hosts_map_.erase(extension_hosts);
 }
 
 }  // namespace chrome