Change media galleries to external file system type to add toURL support

chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h

Index: chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
diff --git a/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h b/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
index a6cfebf45ea6789cadedaf31113491d3fd60de7d..e28c9a6c98cf85474420218eeecb610c3598a27a 100644
--- a/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
+++ b/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
@@ -19,7 +19,7 @@ class IOBuffer;
 }
 
 // Asynchronous delegate for media transfer protocol (MTP) device to perform
-// media device isolated file system operations. Class that implements this
+// media device file system operations. Class that implements this
 // delegate does the actual communication with the MTP device.
 // The lifetime of the delegate is managed by the MTPDeviceMapService class.
 // Member functions and callbacks run on the IO thread.