Revert of Remove ScopedVector from all other codes in media/

media/midi/midi_manager_usb.h

Index: media/midi/midi_manager_usb.h
diff --git a/media/midi/midi_manager_usb.h b/media/midi/midi_manager_usb.h
index 093dfd093898a0932f9a7caf2b8bf1b234181811..8f57d56531e55e3cb643c39ec920b4a2c0fcdfea 100644
--- a/media/midi/midi_manager_usb.h
+++ b/media/midi/midi_manager_usb.h
@@ -64,8 +64,7 @@
                       size_t size,
                       base::TimeTicks time) override;
 
-  const std::vector<std::unique_ptr<UsbMidiOutputStream>>& output_streams()
-      const {
+  const ScopedVector<UsbMidiOutputStream>& output_streams() const {
     return output_streams_;
   }
   const UsbMidiInputStream* input_stream() const { return input_stream_.get(); }
@@ -84,8 +83,8 @@
   bool AddPorts(UsbMidiDevice* device, int device_id);
 
   std::unique_ptr<UsbMidiDevice::Factory> device_factory_;
-  std::vector<std::unique_ptr<UsbMidiDevice>> devices_;
-  std::vector<std::unique_ptr<UsbMidiOutputStream>> output_streams_;
+  ScopedVector<UsbMidiDevice> devices_;
+  ScopedVector<UsbMidiOutputStream> output_streams_;
   std::unique_ptr<UsbMidiInputStream> input_stream_;
 
   base::Callback<void(mojom::Result result)> initialize_callback_;