UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36

Steps to reproduce the problem:
1. Run this fiddle: https://jsfiddle.net/dandv/8cc5annk/
2. Open DevTools and go to the Network tab
3. Choose an image to upload to Google Cloud Vision. A 27-kb PNG file reproduced the issue (http://icons.iconarchive.com/icons/cornmanthe3rd/plex/512/Media-foobar-icon.png)
4. Click on the request in the Network tab that shows the 400 error

What is the expected behavior?
Details about that network request should be shown.

What went wrong?
Chrome CPU usage spikes to 100% for a core. Each reproduction of the behavior engages another core at 100%

Closing the offending tab doesn't reduce the CPU usage below 80% for the affected cores.

Did this work before? N/A 

Chrome version: 51.0.2704.106  Channel: n/a
OS Version: Ubuntu 16.04 64-bit
Flash Version: Shockwave Flash 22.0 r0

Uploading the same image at https://cloud.google.com/vision/ and inspecting the request doesn't trigger the bug, probably because the request didn't error out due to the invalid Google Cloud Vision key ('xxx' on line 1).
 

Deleted: DevTools CPU 100% on network error.png 203 KB

	DevTools CPU 100% on network error.png 203 KB View Download