Call reportFindInPageResultToAccessibility from additional code path.

We should always call reportFindInPageResultToAccessibility whenever
reportFindInPageSelection is called; previously we were only calling it
from TextFinder::find and that didn't cover all cases.

BUG=426414

Review URL: https://codereview.chromium.org/719913002

git-svn-id: svn://svn.chromium.org/blink/trunk@185259 bbb929c8-8fbe-4397-9dbb-9b2b20218538