[PDF] Fix index calculation for Type1 advance retrieval.
[PDF] Fix index calculation for Type1 advance retrieval.

This should fix http://crbug.com/154590

Review URL: https://codereview.appspot.com/6736064

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@6034 2bbb7eff-a529-9590-31e7-b0007b416f81

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