DevTools: Fix disabling all pauses on reload.

BUG=115105, 286081
R=yurys@chromium.org,johnjbarton@chromium.org,pfeldman

Review URL: https://codereview.chromium.org/60203007

git-svn-id: svn://svn.chromium.org/blink/trunk@161920 bbb929c8-8fbe-4397-9dbb-9b2b20218538