[Coverity] Check return value
[Coverity] Check return value

CID=103697

TBR= tommi@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/9956044

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@130246 0039d316-1c4b-4281-b951-d872f2087c98

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