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Precise's gcc warns about variables that are set but never used.

BUG=none
TEST=compiles on Precise.


Review URL: https://chromiumcodereview.appspot.com/10829088

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149073 0039d316-1c4b-4281-b951-d872f2087c98