Example URL:
https://images.google.com

Steps to reproduce the problem:
1. Open Google images
2. Search orange.jpeg
3. Open the first image.then long press on it and select download image option.
4.if download starts with no dialogue box showing as "Do you want to download images.jpeg again?" ,tries to download next image as done as above.then you can see that the dialogue box as mentioned above.
5.if the dialogue box appears for the first time you have reached the problem already...

What is the expected behavior?
Each image should be downloaded with its actual name instead of some default names like images.jpeg,unnamed.png etc.

What went wrong?
The dialogue box is generating for each downloading attempt because the browser tries to download images with some default names like images.jpeg,unnamed.png etc. 

Did this work before? N/A 

Chrome version: 63.0.3239.111  Channel: stable
OS Version: 5.1.1
Flash Version: 

I am submitting this problem here because I already submitted a bug with number 793654 which is not confirmed yet which discusses the same issue.No progress of fixing that bug is taking place. I think this submission will help to continue the progress of fixing that issue.