Being less harsh with CHECKs on NTP4 bookmarks WebUI callbacks.
Being less harsh with CHECKs on NTP4 bookmarks WebUI callbacks.

BUG=93343
R=csilv@chromium.org
TEST=chrome.send('removeBookmark',['999999']); doesn't crash the browser.


Review URL: http://codereview.chromium.org/7839024

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@99923 0039d316-1c4b-4281-b951-d872f2087c98

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