Revert r156019 "DevTools: handle gesture tap event while in inspecting element mode." for breaking layout tests.

TBR=vsevik

Review URL: https://codereview.chromium.org/22897007

git-svn-id: svn://svn.chromium.org/blink/trunk@156030 bbb929c8-8fbe-4397-9dbb-9b2b20218538