Remove MTP support on Linux.

components/storage_monitor/storage_monitor_linux.h

Index: components/storage_monitor/storage_monitor_linux.h
diff --git a/components/storage_monitor/storage_monitor_linux.h b/components/storage_monitor/storage_monitor_linux.h
index 05a59f7c5422456ff0d96378b4ef290631eeb503..a007bf9c7a65b301ea810787c95554fd96fddd68 100644
--- a/components/storage_monitor/storage_monitor_linux.h
+++ b/components/storage_monitor/storage_monitor_linux.h
@@ -31,8 +31,6 @@
 
 namespace storage_monitor {
 
-class MediaTransferProtocolDeviceObserverLinux;
-
 class StorageMonitorLinux : public StorageMonitor,
                             public MtabWatcherLinux::Delegate {
  public:
@@ -54,9 +52,6 @@ class StorageMonitorLinux : public StorageMonitor,
   void SetGetDeviceInfoCallbackForTest(
       const GetDeviceInfoCallback& get_device_info_callback);
 
-  void SetMediaTransferProtocolManagerForTest(
-      device::MediaTransferProtocolManager* test_manager);
-
   // MtabWatcherLinux::Delegate implementation.
   void UpdateMtab(
       const MtabWatcherLinux::MountPointDeviceMap& new_mtab) override;
@@ -95,8 +90,6 @@ class StorageMonitorLinux : public StorageMonitor,
                              StorageInfo* device_info) const override;
   void EjectDevice(const std::string& device_id,
                    base::Callback<void(EjectStatus)> callback) override;
-  device::MediaTransferProtocolManager* media_transfer_protocol_manager()
-      override;
 
   // Called when the MtabWatcher has been created.
   void OnMtabWatcherCreated(MtabWatcherLinux* watcher);
@@ -130,11 +123,6 @@ class StorageMonitorLinux : public StorageMonitor,
   // points.
   MountPriorityMap mount_priority_map_;
 
-  std::unique_ptr<device::MediaTransferProtocolManager>
-      media_transfer_protocol_manager_;
-  std::unique_ptr<MediaTransferProtocolDeviceObserverLinux>
-      media_transfer_protocol_device_observer_;
-
   std::unique_ptr<MtabWatcherLinux, MtabWatcherLinuxDeleter> mtab_watcher_;
 
   base::WeakPtrFactory<StorageMonitorLinux> weak_ptr_factory_;