Officially close PDF files when done writing them. No difference now, but if we ever move to GC, this will prevent problems.
Officially close PDF files when done writing them. No difference now, but if we ever move to GC, this will prevent problems.

BUG=http://crbug.com/33239
TEST=none (does not fix bug)

Review URL: http://codereview.chromium.org/1508015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@43355 0039d316-1c4b-4281-b951-d872f2087c98

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