Convert Find test to interactive, since it relies on focus.

BUG=331160
TBR=sky

Review URL: https://codereview.chromium.org/138543004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245907 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245907