Remove suppression for bug 58074.
Remove suppression for bug 58074.

libpng 1.2.45 fixed the uninitialized bits issue.

BUG=58074
TEST=Valgrind failure in 58074 does not happen.
TBR=oshima@chromium.org

Review URL: http://codereview.chromium.org/7892042

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@101312 0039d316-1c4b-4281-b951-d872f2087c98

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