Created a helper function "FindDiskBySourcePath" in DiskMountManager.

chrome/browser/media_gallery/media_device_notifications_chromeos.cc

Index: chrome/browser/media_gallery/media_device_notifications_chromeos.cc
diff --git a/chrome/browser/media_gallery/media_device_notifications_chromeos.cc b/chrome/browser/media_gallery/media_device_notifications_chromeos.cc
index f8bb783faee3b50d9487b42f756a8025b1451759..ac4486276bc3ef436100bad2409dc13bdb5b4068 100644
--- a/chrome/browser/media_gallery/media_device_notifications_chromeos.cc
+++ b/chrome/browser/media_gallery/media_device_notifications_chromeos.cc
@@ -21,10 +21,9 @@ namespace {
 
 std::string GetDeviceUuid(const std::string& source_path) {
   // Get the media device uuid if exists.
-  const disks::DiskMountManager::DiskMap& disks =
-      disks::DiskMountManager::GetInstance()->disks();
-  disks::DiskMountManager::DiskMap::const_iterator it = disks.find(source_path);
-  return it == disks.end() ? std::string() : it->second->fs_uuid();
+  const disks::DiskMountManager::Disk* disk =
+      disks::DiskMountManager::GetInstance()->FindDiskBySourcePath(source_path);
+  return disk ==  NULL ? std::string() : disk->fs_uuid();

[Ben Chan, 2012/08/03 15:04:55]

return disk ? disk->fs_uuid() : std::string();

[kmadhusu, 2012/08/03 18:13:52]

Fixed.

 }
 
 }  // namespace