Hide comparison view and object allocation range selector for "tracking heap objects" profiles

These profiles contain allocation timeline where the user can select a range to show only objects allocated within that time frame.

BUG=331762
R=alph@chromium.org

Review URL: https://codereview.chromium.org/148133009

git-svn-id: svn://svn.chromium.org/blink/trunk@166007 bbb929c8-8fbe-4397-9dbb-9b2b20218538