Revert "Fix for link highlighting of <img> links"

This reverts commit 697fa04c05532acdc7597c725042a9de1f28e72f.

The change was reverted due to the crash on the test.

BUG=none
TBR=bokan@chromium.org, japhet@chromium.org

Review URL: https://codereview.chromium.org/24361004

git-svn-id: svn://svn.chromium.org/blink/trunk@158189 bbb929c8-8fbe-4397-9dbb-9b2b20218538