Kibana version: master

Elasticsearch version:

Server OS version:

Browser version:

Browser OS version:

Original install method (e.g. download page, yum, from source, etc.):

Describe the bug: If a top legend is chosen for vislib chart types, the chart overflows the x axis on the bottom of the chart.

Steps to reproduce:

1. Create area chart with non-empty top legend and x axis on the bottom
2. Add to dashboard

Expected behavior:
The additional height of the legend should be taken into account for the chart height.

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context: