Devtools: #260211 Re adds the reveal in context menu items on heap views

Moved the population of the context menu out from out of an if statement, 
cleaned up the creation code of the context menu items so that it now shows in the comparison view as well

BUG=260211

Review URL: https://chromiumcodereview.appspot.com/19454002

git-svn-id: svn://svn.chromium.org/blink/trunk@156286 bbb929c8-8fbe-4397-9dbb-9b2b20218538