downloadItem Animation is Broken

[jonathansampson]

• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  The progress bar background does not cover the full downloadItem.

• Platform/Brave Version:

Brave	0.14.2
rev	10539c2
Muon	2.57.8
libchromiumcontent	57.0.2987.133
V8	5.7.492.71
Node.js	7.4.0
Update Channel	dev
os.platform	win32
os.release	10.0.15063
os.arch	x64

• Steps to reproduce:

  1. Download a file
  2. Note issues with downloadItem presentation

• Actual result:
  Progress-bar background only partially fills the element.

• Expected result:
  Progress-bar background should fill the full element.

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Yes

• Is this an issue in the currently released version?
  Yes

• Can this issue be consistently reproduced?
  Yes

• Screenshot if needed:
  

• Any related issues:

[NejcZdovc]

@jonathansampson I would push this into 0.14.2, because we can't ship it like this in my opinion. What do you think?