DevTools: Unify filtering UI

BUG=309674
R=pfeldman@chromium.org, pfeldman

Review URL: https://codereview.chromium.org/33143002

git-svn-id: svn://svn.chromium.org/blink/trunk@160330 bbb929c8-8fbe-4397-9dbb-9b2b20218538