Make unresponsive web page prompts look native

[kdwk]

What Happened?

The unresponsive web page prompt that allows users to wait or kill the web page does not follow the elementary native look of rounded bottom corners and flat header bar.

Steps to Reproduce

1. Visit an unresponsive site
2. Wait for the prompt to appear
3. Observe the dialogue's style

Expected Behavior

The prompt follows the native elementary style of rounded bottom corners and flat header bar.

OS Version

6.x (Odin)

Software Version

Latest release (I have run all updates)

Log Output

No response

Hardware Info

No response

[mcatanzaro]

It also doesn't look anything like the default upstream look. That's already heavily-customized. Strange.

[mcatanzaro]

This is what the upstream theme looks like. What you've shown above is actually -- believe it or not -- an elementary customization....