chromeos: Don't show import-bookmarks link on NTP.
chromeos: Don't show import-bookmarks link on NTP.

BUG=chromium-os:20575
TEST=manual: checked that the link is gone on a chrome os build but still present on linux

Review URL: http://codereview.chromium.org/7969003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@101960 0039d316-1c4b-4281-b951-d872f2087c98

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