DevTools: Show doc context menu items for matching methods on all objects

If a few target objects have a method with the same name as the selection,
we should create context menu items for all of them.

BUG=391593

Review URL: https://codereview.chromium.org/466743002

git-svn-id: svn://svn.chromium.org/blink/trunk@180161 bbb929c8-8fbe-4397-9dbb-9b2b20218538