[CrosDisksClient] Determine device type from DeviceMediaType property sent by cros-disks.

chrome/browser/chromeos/disks/disk_mount_manager.h

Index: chrome/browser/chromeos/disks/disk_mount_manager.h
diff --git a/chrome/browser/chromeos/disks/disk_mount_manager.h b/chrome/browser/chromeos/disks/disk_mount_manager.h
index c5c9da9752bd746a4a57e334c0c912128374c36b..6ecb2b7b54f6b2757a62fbfc28b5c6e0c1aae3fc 100644
--- a/chrome/browser/chromeos/disks/disk_mount_manager.h
+++ b/chrome/browser/chromeos/disks/disk_mount_manager.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -233,6 +233,9 @@ class DiskMountManager {
   // Returns corresponding string to |type| like "unknown_filesystem".
   static std::string MountConditionToString(MountCondition type);
 
+  // Returns corresponding string to |type|, like "sd", "usb".
+  static std::string DeviceTypeToString(DeviceType type);
+
   // Creates the global DiskMountManager instance.
   static void Initialize();