DevTools: [Console] fix search to reveal matched messages

During console migration on viewport revealing search results was
forgotten.
This patch fixes this.

BUG=388718
R=pfeldman

Review URL: https://codereview.chromium.org/354013002

git-svn-id: svn://svn.chromium.org/blink/trunk@177118 bbb929c8-8fbe-4397-9dbb-9b2b20218538