ntp4: fix most visited dragging onto bookmarks bar
ntp4: fix most visited dragging onto bookmarks bar

setting dummy text was overriding the default <a> drag handling.

BUG=93195
TEST=manual


Review URL: http://codereview.chromium.org/7670056

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@97277 0039d316-1c4b-4281-b951-d872f2087c98

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