Break lines in review Gerrit comments

The comments — both inline and reviews  — are now identified by
the CSS class commentPanelMessage

Dropping declaration for GJEA35ODLB and GJEA35ODOC Gerrit 2.4 classes.
Adding declaration for commentPanelMessage class.

This is a follow-up of change I5062b5ad6b8d39d99f50a626fc9aa90bd728245f.

Bug: 39767
Change-Id: Ie4a26b723aec88f17300855b904a6ddd1324328d
Merge "Break lines in review Gerrit comments" into production