mac: Prepare for -Wunused-functions.

chrome/browser/storage_monitor/media_storage_util.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.
 
 #include "chrome/browser/storage_monitor/media_storage_util.h"
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/file_util.h"
@@ skipping 19 matching lines @@
   MTP_STORAGE_DEVICE_UUID_MISSING,
   MTP_STORAGE_DEVICE_NAME_MISSING,
   MTP_STORAGE_DEVICE_NAME_AND_UUID_MISSING,
   DEVICE_INFO_BUCKET_BOUNDARY
 };
 
 #if !defined(OS_WIN)
 const char kRootPath[] = "/";
 #endif
 
-void ValidatePathOnFileThread(
-    const base::FilePath& path,
-    const base::Callback<void(bool)>& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                          base::Bind(callback, base::PathExists(path)));
-}
-
 typedef std::vector<StorageInfo> StorageInfoList;
 
 base::FilePath::StringType FindRemovableStorageLocationById(
     const std::string& device_id) {
   StorageInfoList devices =
       StorageMonitor::GetInstance()->GetAllAvailableStorages();
   for (StorageInfoList::const_iterator it = devices.begin();
        it != devices.end(); ++it) {
     if (it->device_id() == device_id
         && StorageInfo::IsRemovableDevice(device_id))
@@ skipping 186 matching lines @@
 bool MediaStorageUtil::IsRemovableStorageAttached(const std::string& id) {
   StorageInfoList devices =
       StorageMonitor::GetInstance()->GetAllAvailableStorages();
   for (StorageInfoList::const_iterator it = devices.begin();
        it != devices.end(); ++it) {
     if (StorageInfo::IsRemovableDevice(id) && it->device_id() == id)
       return true;
   }
   return false;
 }