DevTools: Move some tests to inspector-enabled folder in preparation to loading HTML resources content on inspector start

BUG=354447
TBR=pfeldman

Review URL: https://codereview.chromium.org/369983002

git-svn-id: svn://svn.chromium.org/blink/trunk@177533 bbb929c8-8fbe-4397-9dbb-9b2b20218538