Apply user highlighting for all revisions in DOM

This only solves part of the issue. Highlighting is applied for more
elements since they are retrieved from the DOM. The problem still exists
since highlighting depends on the RevisionList chunk on which is it applied.

To fix the issue completely highlighing should be managed somehow globally
on the global list.

Bug: T207781
Change-Id: Idda930f3d0dd64e767c68dade2ca8759bc636898