Suppressing UninitCondition in power library

TBR=glotov@chromium.org
BUG=73048
TEST=none

Review URL: http://codereview.chromium.org/6480082

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@74991 0039d316-1c4b-4281-b951-d872f2087c98