Remove MTP support on Linux.

components/storage_monitor/storage_monitor_chromeos.cc

Index: components/storage_monitor/storage_monitor_chromeos.cc
diff --git a/components/storage_monitor/storage_monitor_chromeos.cc b/components/storage_monitor/storage_monitor_chromeos.cc
index e8b55374732f5584b09eadd0c3ee95b560868cff..228cc4408c2f2aa04b965f46d51c4e57ab128990 100644
--- a/components/storage_monitor/storage_monitor_chromeos.cc
+++ b/components/storage_monitor/storage_monitor_chromeos.cc
@@ -13,7 +13,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/storage_monitor/media_storage_util.h"
-#include "components/storage_monitor/media_transfer_protocol_device_observer_linux.h"
+#include "components/storage_monitor/media_transfer_protocol_device_observer_chromeos.h"
 #include "components/storage_monitor/removable_device_constants.h"
 #include "content/public/browser/browser_thread.h"
 #include "device/media_transfer_protocol/media_transfer_protocol_manager.h"
@@ -111,7 +111,7 @@ void StorageMonitorCros::Init() {
   }
 
   media_transfer_protocol_device_observer_.reset(
-      new MediaTransferProtocolDeviceObserverLinux(
+      new MediaTransferProtocolDeviceObserverChromeOS(
           receiver(), media_transfer_protocol_manager_.get()));
 }