[StorageMonitor] Move StorageMonitor ownership to BrowserProcessImpl

chrome/browser/storage_monitor/storage_monitor_mac.mm

 // 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/storage_monitor_mac.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 351 matching lines @@
   for (std::map<std::string, StorageInfo>::const_iterator
       it = disk_info_map_.begin(); it != disk_info_map_.end(); ++it) {
     if (it->second.location() == mount_point.value()) {
       *info = it->second;
       return true;
     }
   }
   return false;
 }
 
+StorageMonitor* StorageMonitor::Create() {
+  return new StorageMonitorMac();
+}
+
 }  // namespace chrome