[SystemInfo API] Rewrite storage info provider using storage monitor impl

chrome/browser/storage_monitor/storage_monitor_chromeos.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.
 
 // chromeos::StorageMonitorCros implementation.
 
 #include "chrome/browser/storage_monitor/storage_monitor_chromeos.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 264 matching lines @@
 
   manager->UnmountPath(mount_path, chromeos::UNMOUNT_OPTIONS_NONE,
                        base::Bind(NotifyUnmountResult, callback));
 }
 
 device::MediaTransferProtocolManager*
 StorageMonitorCros::media_transfer_protocol_manager() {
   return media_transfer_protocol_manager_.get();
 }
 
+std::vector<chrome::StorageInfo>
+StorageMonitorCros::GetAllAvailableStorages() const {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  std::vector<chrome::StorageInfo> results;
+
+  for (MountMap::const_iterator it = mount_map_.begin();
+       it != mount_map_.end(); ++it)
+    results.push_back(it->second);
+
+  return results;
+}
+
 void StorageMonitorCros::AddMountedPath(
     const disks::DiskMountManager::MountPointInfo& mount_info, bool has_dcim) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (ContainsKey(mount_map_, mount_info.mount_path)) {
     // CheckExistingMountPointsOnUIThread() added the mount point information
     // in the map before the device attached handler is called. Therefore, an
     // entry for the device already exists in the map.
     return;
   }
 
   // Get the media device uuid and label if exists.
   chrome::StorageInfo info;
   if (!GetDeviceInfo(mount_info, has_dcim, &info))
     return;
 
   if (info.device_id().empty())
     return;
 
   mount_map_.insert(std::make_pair(mount_info.mount_path, info));
 
   receiver()->ProcessAttach(info);
 }
 
 }  // namespace chromeos