Show "Reveal in Dominator View" contenxt menu item only in advanced mode

Dominator view is present in the heap profiler only in advanced mode so it makes sense to hide corresponding action in the context menu.

BUG=None
R=alph@chromium.org

Review URL: https://codereview.chromium.org/132563007

git-svn-id: svn://svn.chromium.org/blink/trunk@166612 bbb929c8-8fbe-4397-9dbb-9b2b20218538