This is a follow-up to https://chromiumcodereview.appspot.com/
16305010/. To eradicate the discrepancy between find bar text and actual search term we'll always search for current find bar text on Mac. This is correct because find bar updates itself whenever the find pboard changes.
The test strengthened to reproduce the bug.
BUG=272291
TBR=estade@chromium.org
Review URL: https://chromiumcodereview.appspot.com/
22796022
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@219530 0039d316-1c4b-4281-b951-d872f2087c98