[Bug Report] Using "small" on <v-btn icon> has no effect inside <v-toolbar>

[cars10]

Environment

Vuetify Version: 2.0.1
Vue Version: 2.6.10
Browsers: Chrome 75.0.3770.142
OS: Linux x86_64

Steps to reproduce

Add <v-btn small icon> inside a toolbar.

Expected Behavior

The button is small when hovering.

Actual Behavior

The size does not change compared to a button that does not have the small prop.

Reproduction Link

https://codepen.io/anon/pen/WVGzEw?editors=1010#0

Both buttons are the same size but one has the small prop.