Revert "DevTools: Fix the bug when open resource dialog sometimes loses focus when opened at the app start."

This reverts commit 5a451ea411cafa6498846fac862778e5f5d967e3.

TBR=pfeldman
BUG=318015

Review URL: https://codereview.chromium.org/60093003

git-svn-id: svn://svn.chromium.org/blink/trunk@161771 bbb929c8-8fbe-4397-9dbb-9b2b20218538