Corresponding Chromium Issue: http://code.google.com/p/chromium/issues/detail?id=42654
Skia now has an option for rendering higher quality blurs. The option needs to be turned on in the skia integration layer in WebKit.
A patch that resolves this bug was submitted for review against bug 55506
Temporarily assigning to Justin until this is closed as a dup of the other.
Got fixed with r81489