DevTools: Consume document click event when it is handled by inspector.

R=apavlov
BUG=365218
NOTRY=true

Review URL: https://codereview.chromium.org/244883002

git-svn-id: svn://svn.chromium.org/blink/trunk@172017 bbb929c8-8fbe-4397-9dbb-9b2b20218538