DevTools: Speedup window selection in heap allocations tracking.

Do not make extra call to updateVisibleNodes as another one
has already been performed in sortingChanged -> recursiveSortingLeave

Review URL: https://codereview.chromium.org/197313012

git-svn-id: svn://svn.chromium.org/blink/trunk@169301 bbb929c8-8fbe-4397-9dbb-9b2b20218538