TimelinePanel: REGRESSION: frame duration bars appear in the Memory and Event views.

Now when we are using single TimelineView we have to set or drop frameModel each time when we select another view.

BUG=
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/195173003

git-svn-id: svn://svn.chromium.org/blink/trunk@168928 bbb929c8-8fbe-4397-9dbb-9b2b20218538