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This fixes the find elements command when used on pages with prototype JS lib.
BUG=chromedriver:102
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10829048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148795 0039d316-1c4b-4281-b951-d872f2087c98