[ntp4] Remove work-around for a WebKit crash, obsolete with latest roll.
[ntp4] Remove work-around for a WebKit crash, obsolete with latest roll.

This fixes a visual blurring bug introduced by the work-around.

BUG=96953
TEST=Verify that dragging bookmarks does not exhibit visual blur.
Review URL: http://codereview.chromium.org/7966001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@102039 0039d316-1c4b-4281-b951-d872f2087c98

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