Remove valgrind suppressions from bugs 50728 and 50766
Remove valgrind suppressions from bugs 50728 and 50766

The underlying cause of these errors was fixed in http://codereview.chromium.org/2873081/show .

BUG=none
TEST=valgrind tests pass

Review URL: http://codereview.chromium.org/3033044

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@54997 0039d316-1c4b-4281-b951-d872f2087c98

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