Fix convert to bool warning in VS http://codereview.appspot.com/5371051/
Fix convert to bool warning in VS
http://codereview.appspot.com/5371051/



git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@2658 2bbb7eff-a529-9590-31e7-b0007b416f81

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