Revert 149812 - [CrOS] Enumerate existing mount points and check for media devices.

chrome/browser/media_gallery/media_device_notifications_chromeos.cc

Index: chrome/browser/media_gallery/media_device_notifications_chromeos.cc
===================================================================
--- chrome/browser/media_gallery/media_device_notifications_chromeos.cc	(revision 149814)
+++ chrome/browser/media_gallery/media_device_notifications_chromeos.cc	(working copy)
@@ -46,7 +46,6 @@
 MediaDeviceNotifications::MediaDeviceNotifications() {
   DCHECK(disks::DiskMountManager::GetInstance());
   disks::DiskMountManager::GetInstance()->AddObserver(this);
-  CheckExistingMountPointsOnUIThread();
 }
 
 MediaDeviceNotifications::~MediaDeviceNotifications() {
@@ -56,19 +55,6 @@
   }
 }
 
-void MediaDeviceNotifications::CheckExistingMountPointsOnUIThread() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  const disks::DiskMountManager::MountPointMap& mount_point_map =
-      disks::DiskMountManager::GetInstance()->mount_points();
-  for (disks::DiskMountManager::MountPointMap::const_iterator it =
-           mount_point_map.begin(); it != mount_point_map.end(); ++it) {
-    BrowserThread::PostTask(
-        BrowserThread::FILE, FROM_HERE,
-        base::Bind(&MediaDeviceNotifications::CheckMountedPathOnFileThread,
-                   this, it->second));
-  }
-}
-
 void MediaDeviceNotifications::DiskChanged(
     disks::DiskMountManagerEventType event,
     const disks::DiskMountManager::Disk* disk) {