Fix narrow dropzone of items in the language list
Fix narrow dropzone of items in the language list

BUG=chromium-os:14320
TEST=1. Open "Languages and Input" preference page
2. Add several languages
3. Start dragging the 1st item
4. Drop it between the 2nd and the 3rd item

Without this patch, the item is moved only when we drop the item
exactly on the border line separating the 2nd and the 3rd item
(exception: the left blank zone of the label text accepts the drop
whereever we choose). In other words, we cannot drop over the label
text.

With this patch, we can drop over any area on list items.

The cause of the issue is, that the introduction of [x] button
http://codereview.chromium.org/6759049 adds <div> element below
<li> element. Current implementation accepts drop only over <li>
elements.

Review URL: http://codereview.chromium.org/6899016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@83074 0039d316-1c4b-4281-b951-d872f2087c98

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