[fsp] Add requestUnmount() method together with the request manager.

chrome/browser/chromeos/extensions/file_manager/private_api_util.cc

 // Copyright 2013 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/chromeos/extensions/file_manager/private_api_util.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 107 matching lines @@
   GetSelectedFileInfoInternal(profile, params.Pass());
 }
 
 }  // namespace
 
 void VolumeInfoToVolumeMetadata(
     Profile* profile,
     const VolumeInfo& volume_info,
     file_browser_private::VolumeMetadata* volume_metadata) {
   DCHECK(volume_metadata);
-  DCHECK(!volume_info.mount_path.empty());
 
   volume_metadata->volume_id = volume_info.volume_id;
 
   // TODO(kinaba): fill appropriate information once multi-profile support is
   // implemented.
   volume_metadata->profile.display_name = profile->GetProfileName();
   volume_metadata->profile.is_current_profile = true;
 
   if (!volume_info.source_path.empty()) {
     volume_metadata->source_path.reset(
@@ skipping 141 matching lines @@
 
 drive::EventLogger* GetLogger(Profile* profile) {
   drive::DriveIntegrationService* service =
       drive::DriveIntegrationServiceFactory::FindForProfileRegardlessOfStates(
           profile);
   return service ? service->event_logger() : NULL;
 }
 
 }  // namespace util
 }  // namespace file_manager