Revert "TimelinePanel: convert another portion of getters on TimelineModel.Record into functions"

This reverts commit d1a508bef21c9b9f8dba58b44ae1e40442be1dec.

a few tests were broken

BUG=
TBR=yurys

Review URL: https://codereview.chromium.org/252673003

git-svn-id: svn://svn.chromium.org/blink/trunk@172622 bbb929c8-8fbe-4397-9dbb-9b2b20218538